You should read the following discussion and analysis of our financial condition and results of operations in conjunction with our condensed financial statements and related notes included elsewhere in this Quarterly Report on Form 10-Q and our final prospectus, dated July 29, 2021, filed with the Securities and Exchange Commission pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended (the Prospectus).

In addition to historical financial information, this discussion and analysis and other parts of this report contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, based upon current expectations that involve risks, uncertainties and assumptions. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors, including those set forth in the section titled "Risk Factors" under Part II, Item 1A. below. You should carefully read the "Risk Factors" to gain an understanding of the factors that could cause actual results to differ materially from our forward-looking statements. Please also see the section titled "Special Note Regarding Forward-Looking Statements."

Overview

We are a biotechnology company headquartered in South San Francisco, California focused on discovering, designing, developing and delivering curative therapies that address the underlying drivers of heart disease. We are advancing a pipeline of disease-modifying therapies developed using our product platforms and core internal capabilities to target defined sub-populations of patients with rare or highly prevalent forms of heart disease.

We were incorporated in August 2016 and commenced operations thereafter. Our operations to date have included developing our gene therapy, cellular regeneration and precision medicine platforms, identifying and developing product candidates, conducting preclinical studies, acquiring technology, organizing and recruiting management and technical staff, business planning, establishing our intellectual property portfolio, raising capital, and providing general and administrative support for these operations. All of our programs are currently in the preclinical stage and we do not have any products approved for sale. We have not generated any revenue.

We are advancing a deep and diverse pipeline that includes both gene therapies and small molecules. In 2022, we intend to submit an investigational new drug application (IND) or a clinical trial application (CTA) to the U.S. Food and Drug Administration (FDA) or European Medicines Agency (EMA), respectively, for the most advanced product candidate from our Gene Therapy platform, TN-201, an adeno-associated virus (AAV)-based gene therapy to address genetic hypertrophic cardiomyopathy (gHCM) caused by Myosin Binding Protein C3 (MYBPC3) gene mutations. TN-201, currently in IND-enabling studies, is designed to deliver a fully functional MYBPC3 gene driven by our proprietary heart-specific promoter to restore normal levels of MYBPC3 protein.

We also intend to submit an IND to the FDA in 2022 for the most advanced product candidate from our Precision Medicine platform, TYA-11631, a highly specific small molecule inhibitor of histone deacetylase 6 (HDAC6i). TYA-11631, currently in IND-enabling studies, has potentially broad utility in both heart failure (HF) with preserved ejection fraction (HFpEF) as well as genetic dilated cardiomyopathy (gDCM). Our PKP2 program involves using an AAV-based gene therapy to address genetic arrhythmogenic right ventricular cardiomyopathy (gARVC) caused by plakophilin 2 (PKP2) gene mutations, and is currently at the candidate selection stage. Our DWORF program, an AAV-based gene therapy designed to express the Dwarf Open Reading Frame (DWORF) gene in the heart, has potentially broad utility in dilated cardiomyopathy (DCM) and HF with reduced ejection fraction (HFrEF), and is currently at the candidate selection stage. Our Reprogramming program for cardiac regeneration can potentially replace heart cells lost in patients experiencing HF due to prior myocardial infarction (MI), and is currently at the candidate selection stage. In addition, we have numerous earlier-stage programs emerging from our product platforms to address other forms of HF.

Since our inception, we have incurred net losses each year and we expect to continue to incur significant and increasing losses for the foreseeable future as we continue to advance our platforms, programs and product candidates, and as we transition to operating as a public company. Our net losses may fluctuate significantly from period to period, depending on the timing of expenditures on our research and development activities. Our net losses were $28.3 million and $17.8 million for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021, we had an accumulated deficit of $111.1 million and cash and cash equivalents of $111.9 million. Our net losses resulted primarily from our research and development programs and, to a lesser extent, general and administrative costs associated with our operations. Historically, we have funded our operations primarily from the sale and issuance of our convertible preferred stock.





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Initial Public Offering

On August 3, 2021, we completed an initial public offering (IPO) of our common stock in which we issued an aggregate of 13,800,000 shares of our common stock (inclusive of 1,800,000 shares pursuant to the underwriters' overallotment option) at a price of $15.00 per share. We received net proceeds of approximately $188.8 million from the IPO, after deducting underwriting discounts and commissions of $14.5 million and offering costs of $3.7 million.

COVID-19

The global COVID­19 pandemic continues to evolve. Potential impacts to our business include disruptions or restrictions on our employees' ability to effectively conduct their work. In addition, some of our suppliers of certain lab materials, or service providers used in the performance of our research activities, are located in the areas impacted by COVID-19, which could limit our ability to achieve planned progress. COVID-19 could adversely affect the economies and financial markets, resulting in an economic downturn that could affect our financing prospects. To date, we have experienced modest delays in the progress of our research and development activities, primarily due to extended lead times at certain suppliers and temporary and partial shutdowns at certain academic institutions as a result of statewide stay-at-home orders. However, these stay-at-home orders have largely terminated and operations have since resumed. We continue to monitor and assess the effects of the COVID-19 pandemic on our business, but the ultimate impact of the COVID-19 outbreak or a similar health epidemic is highly uncertain and subject to change. For additional details, see Part II, Item 1A. "Risk Factors."

Components of Operating Results

Research and Development

Research and development activities account for a significant portion of our operating expenses. Research and development expenses relate primarily to discovery and development of our platforms, programs and product candidates, and are recognized as incurred. Internal research and development costs include, among others, personnel-related costs (including salaries, benefits, travel and stock-based compensation for employees engaged in research and development functions), laboratory supplies and other non-capital equipment utilized for in-house research, allocated facilities and overhead costs. External research and development expenses include, among others, amounts incurred to clinical research organizations (CROs) that conduct research and development activities on our behalf, consulting fees and amounts owed under licensing agreements. We do not allocate our costs by platform, program or product candidate, as a significant amount of research and development expenses include internal costs, which are deployed across multiple platforms, programs, product candidates and activities.

Amounts recorded for external goods or services incurred for research and development activities that have not yet been invoiced often represent estimates. We do not currently have projects that require estimates for percentage of completion and we record estimates for amounts due but not yet invoiced based on input from external service providers.

We expect our research and development expenses to increase for the foreseeable future as we continue to invest in research and development activities related to developing our platforms, programs and product candidates and progressing through preclinical and clinical product development stages. The process of conducting the necessary research to advance to the clinical stage and ultimately obtain regulatory approval is costly and time-consuming, and the successful development of our product candidates is highly uncertain. As a result, we are unable to determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our product candidates.

General and Administrative

General and administrative expenses consist of personnel-related costs (including salaries, benefits, travel and stock-based compensation for our employees in executive, finance and other administrative functions), legal fees, professional fees incurred for accounting, audit, and tax services, recruiting costs, and facility costs not otherwise included in research and development expenses. Legal fees include those related to corporate and intellectual property related matters.

We expect that our general and administrative expenses will increase for the foreseeable future to support our continued research and development activities, general operations, future business development opportunities and professional fees. In addition, we expect to incur additional expenses associated with operating as a public company, including legal, accounting, insurance, exchange listing, SEC compliance, and investor relations costs.

Interest Income

Interest income primarily consists of interest earned on our cash, cash equivalents and investment balances.



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Change in Fair Value of Convertible Preferred Stock Tranche Liability

The change in fair value of our convertible preferred stock tranche liability fluctuates based on remeasurements at each reporting period. Our convertible preferred stock tranche liability stemmed from our obligation to issue additional shares to investors upon the second and third closings of our Series B convertible preferred stock. Until settlement, fluctuations in the fair value of a convertible preferred stock tranche liability are based on the remeasurement at each reporting period. Our convertible preferred stock tranche liability was settled on the second and third closings of our Series B convertible preferred stock financing in March and August 2020, respectively.

Other Income (Expense), Net

Other income (expense), net primarily consists of sublease income for a portion of our facilities in South San Francisco during 2020.

Results of Operations

Comparison of the Three Months Ended June 30, 2021 and 2020



The following table summarizes our results of operations for the periods
presented:



                                        Three Months Ended
                                             June 30,                  $               %
                                       2021            2020          Change          Change
                                                 (In thousands)
Operating expenses:
Research and development            $    10,906     $    6,958     $    3,948         57%
General and administrative                4,331          1,914          2,417         126%
Total operating expenses                 15,237          8,872          6,365         72%
Loss from operations                    (15,237 )       (8,872 )       (6,365 )       72%
Other income (expense), net:
Interest income                               9             18             (9 )       50%
Change in fair value of
convertible preferred
  stock tranche liability                     -            (57 )           57         100%
Other income (expense), net                  18            180           (162 )       90%
Total other income (expense), net            27            141           (114 )       81%

Net loss and comprehensive loss $ (15,210 ) $ (8,731 ) $ (6,479 ) 74%

Research and Development Expenses



The following table summarizes our research and development expenses for the
periods presented:



                                            Three Months Ended
                                                 June 30,                $           %
                                             2021          2020       Change      Change
                                                    (In thousands)
Facility and laboratory costs             $     4,621     $ 2,530     $ 2,091       83%
Personnel-related costs                         3,548       2,474       1,074       43%
External costs                                  2,687       1,915         772       40%
Other research and development expenses            50          39          11       28%

Total research and development expenses $ 10,906 $ 6,958 $ 3,948 57%

Research and development expenses were $10.9 million and $7.0 million for the three months ended June 30, 2021 and 2020, respectively. The change of $3.9 million, or 57%, was primarily due to:



   •  an increase of $2.1 million in facility and laboratory costs, including
      laboratory supplies and materials and other allocated costs, as we ramped up
      our research and development operations;


   •  an increase of $1.1 million in personnel-related costs, including
      stock-based compensation, primarily due to growth in the number of our
      research and development employees as we expanded our research and
      development capabilities; and


   •  an increase of $0.8 million in external costs, including amounts paid to
      CROs for research and development activities, consulting fees, preclinical
      studies and other external research expenses as we progressed development of
      our programs.


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General and Administrative

General and administrative expenses were $4.3 million and $1.9 million for the three months ended June 30, 2021 and 2020, respectively. The change of $2.4 million, or 126%, was primarily due to a $1.0 million increase in professional service expenses, as we prepared to become a public company, a $0.9 million increase in personnel-related expenses, including stock-based compensation, as a result of higher headcount as we grew our operations and a $0.3 million increase in facility and related costs, as we leased additional space in 2021.

Interest Income

Interest income was $9,000 and $18,000 for the three months ended June 30, 2021 and 2020, respectively. The decrease of $9,000, or 50%, was primarily due to a change in our investment portfolio mix.

Change in Fair Value of Convertible Preferred Stock Tranche Liability

The change in fair value of our convertible preferred stock tranche liability for the three months ended June 30, 2020 was attributable to changes in the fair value of the underlying Series B convertible preferred stock. There was no similar expense for the three months ended June 30, 2021 as our convertible preferred stock tranche liability was settled in 2020.

Other Income (Expense), Net

Other income (expense), net of $0.2 million for the three months ended June 30, 2020 was primarily related to sublease income. Our sublease agreements expired during 2020.

Comparison of the Six Months Ended June 30, 2021 and 2020



The following table summarizes our results of operations for the periods
presented:



                                        Six Months Ended
                                            June 30,                  $               %
                                       2021           2020          Change          Change
                                                 (In thousands)
Operating expenses:
Research and development            $   20,496     $   14,255     $    6,241         44%
General and administrative               7,846          3,883          3,963         102%
Total operating expenses                28,342         18,138         10,204         56%
Loss from operations                   (28,342 )      (18,138 )      (10,204 )       56%
Other income (expense), net:
Interest income                             18             75            (57 )       76%
Change in fair value of
convertible preferred
  stock tranche liability                    -            (76 )           76         100%
Other income (expense), net                 16            357           (341 )       96%
Total other income (expense), net           34            356           (322 )       90%

Net loss and comprehensive loss $ (28,308 ) $ (17,782 ) $ (10,526 ) 59%






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Research and Development Expenses



The following table summarizes our research and development expenses for the
periods presented:



                                            Six Months Ended
                                                June 30,               $           %
                                            2021         2020       Change      Change
                                                   (In thousands)
Facility and laboratory costs             $  8,715     $  5,130     $ 3,585       70%
Personnel-related costs                      6,885        4,906       1,979       40%
External costs                               4,731        4,064         667       16%

Other research and development expenses 165 155 10 6% Total research and development expenses $ 20,496 $ 14,255 $ 6,241 44%

Research and development expenses were $20.5 million and $14.3 million for the six months ended June 30, 2021 and 2020, respectively. The change of $6.2 million, or 44%, was primarily due to:



    •  an increase of $3.6 million in facility and laboratory costs, including
       laboratory supplies and materials and other allocated costs, as we ramped
       up our research and development operations;


    •  an increase of $2.0 million in personnel-related costs, including
       stock-based compensation, primarily due to growth in the number of our
       research and development employees as we expanded our research and
       development capabilities; and


    •  an increase of $0.7 million in external costs, including amounts paid to
       CROs for research and development activities, consulting fees, preclinical
       studies and other external research expenses as we progressed development
       of our programs.


General and Administrative

General and administrative expenses were $7.8 million and $3.9 million for the six months ended June 30, 2021 and 2020, respectively. The change of $4.0 million, or 102%, was primarily due to a $1.8 million increase in professional service expenses and a $1.5 million increase in personnel-related expenses, including stock-based compensation, as a result of higher headcount as we grew our operations and a $0.3 million increase in facility and related costs, as we leased additional space in 2021.

Interest Income

Interest income was $18,000 and $75,000 for the six months ended June 30, 2021 and 2020, respectively. The decrease of $57,000, or 76%, was primarily due to a change in our investment portfolio mix.

Change in Fair Value of Convertible Preferred Stock Tranche Liability

The change in fair value of our convertible preferred stock tranche liability for the six months ended June 30, 2020 was attributable to changes in the fair value of the underlying Series B convertible preferred stock. There was no similar expense for the six months ended June 30, 2021 as our convertible preferred stock tranche liability was settled in 2020.

Other Income (Expense), Net

Other income (expense), net of $0.4 million for the six months ended June 30, 2020 was primarily related to sublease income. Our sublease agreements expired during 2020.

Liquidity and Capital Resources

Sources of Liquidity

Since our inception, we have not generated any revenue and we have incurred significant net losses and negative cash flows from operations. From our inception through June 30, 2021, we have funded our operations primarily from the sale and issuance of our convertible preferred stock, from which we have raised an aggregate of $247.9 million in gross proceeds. As of June 30, 2021, we had cash and cash equivalents of $111.9 million and an accumulated deficit of $111.1 million.



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In connection with our IPO, we issued and sold 13,800,000 shares of our common stock at a price of $15.00 per share for net proceeds of approximately $188.8 million.

Funding Requirements

We expect our expenses and operating losses will increase substantially over the foreseeable future. The expected increase in expenses will be driven in large part by our ongoing activities, if and as we:



    •  continue to advance our Gene Therapy, Cellular Regeneration and Precision
       Medicine platforms;


    •  continue preclinical development of our product candidates and initiate
       additional preclinical studies;


  • commence clinical trials of our product candidates;


    •  build out our manufacturing facilities and establish our manufacturing
       capabilities, including developing our contract development and
       manufacturing relationships;


    •  acquire and license technologies aligned with our Gene Therapy, Cellular
       Regeneration and Precision Medicine platforms;


    •  seek regulatory approval of our product candidates that successfully
       complete clinical trials;


    •  expand our operational, financial, and management systems and increase
       personnel, including personnel to support our preclinical and clinical
       development, manufacturing, and future commercialization efforts;


    •  continue to develop, grow, perfect, enforce and defend our intellectual
       property portfolio; and


    •  incur additional legal, accounting, and other expenses in operating our
       business, including the additional costs associated with operating as a
       public company.

Based on our current operating plan, we believe that our existing cash and cash equivalents, together with the net proceeds received from the IPO, will be sufficient to meet our working capital and capital expenditure needs through at least the next twelve months from the date of this Quarterly Report on Form 10-Q.

We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we expect. We may also raise additional financing on an opportunistic basis in the future. We expect to continue to expend significant resources for the foreseeable future.

In order to complete the development of our product candidates and commercialize our product candidates, if approved, we will require substantial additional funding. Until such time as we can generate significant revenue from sales of our product candidates, if ever, we expect to finance our operations through public or private equity offerings or debt financings or other capital sources, which may include strategic collaborations or other arrangements with third parties, or other sources of financing. We may not be able to raise additional capital on terms acceptable to us or at all. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our stockholders will be or could be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing and preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, including restricting our operations and limiting our ability to incur liens, issue additional debt, pay dividends, repurchase our common stock, make certain investments or engage in merger, consolidation, licensing or asset sale transactions. If we raise funds through strategic collaborations, partnerships and other similar arrangements with third parties, we may be required to grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves. If we are unable to raise additional capital on acceptable terms when needed, our business, results of operations, and financial condition would be adversely affected.

Our ability to raise additional funds may be adversely impacted by potential worsening global economic conditions and the recent disruptions to, and volatility in, the credit and financial markets in the United States and worldwide resulting from the ongoing COVID-19 pandemic. If we fail to obtain necessary capital when needed on acceptable terms, or at all, it could force us to delay, limit, reduce or terminate our product development programs, future commercialization efforts or other operations. Because of the numerous risks and uncertainties associated with research, product development and commercialization of product candidates, we are unable to predict the timing or amount of our working capital requirements or when or if we will be able to achieve or maintain profitability.



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Cash Flows

The following table summarizes our cash flows for each of the periods indicated:





                                          Six Months Ended
                                              June 30,
                                         2021          2020
                                           (In thousands)
Net cash provided by (used in):
Operating activities                   $ (27,808 )   $ (15,512 )
Investing activities                      (7,559 )       1,329
Financing activities                      18,717        30,649

Net change in cash, cash equivalents


  and restricted cash                  $ (16,650 )   $  16,466




Operating Activities

Net cash used in operating activities for the six months ended June 30, 2021 was $27.8 million, which consisted primarily of a net loss of $28.3 million and a net change in net operating assets and liabilities of $2.3 million, partially offset by $2.8 million in non-cash charges. The non-cash charges primarily consisted of depreciation and amortization of $1.4 million, stock-based compensation of $0.9 million and non-cash operating lease expense of $0.4 million. The change in net operating assets and liabilities was primarily due to an increase in other non-current assets of $3.0 million related to a security deposit for a lease entered into in February 2021, and a decrease in operating lease liabilities of $0.7 million, partially offset by an increase in accounts payable and accrued expenses and other current liabilities of $1.3 million and a decrease in prepaid expenses and other current assets of $0.1 million.

Net cash used in operating activities for the six months ended June 30, 2020 was $15.5 million, which consisted primarily of a net loss of $17.8 million, partially offset by non-cash charges of $1.6 million and a net change in net operating assets and liabilities of $0.6 million. The non-cash charges primarily consisted of depreciation and amortization of $1.2 million and stock-based compensation of $0.3 million. The change in net operating assets and liabilities was primarily due to an increase in accounts payable and accrued expenses and other current liabilities of $0.9 million and a decrease in prepaid expenses and other current assets of $0.3 million, partially offset by a decrease in deferred rent and other lease liabilities of $0.4 million and an increase in other non-current assets of $0.2 million as we expanded our operations.

Investing Activities

Net cash used in investing activities for the six months ended June 30, 2021 was $7.6 million, which consisted of purchases of property and equipment that primarily related to our manufacturing and office space in the San Francisco Bay Area.

Net cash provided by investing activities for the six months ended June 30, 2020 was $1.3 million, which consisted of proceeds from maturities of marketable securities of $2.8 million, partially offset by purchases of property and equipment of $1.4 million.

Financing Activities

Net cash provided by financing activities for the six months ended June 30, 2021 was $18.7 million, which consisted of net proceeds received from the sale and issuance of our Series C convertible preferred stock of $20.0 million, proceeds from the exercise of stock options of $0.1 million and proceeds of $0.1 million from repayments on notes receivable from stockholders, partially offset by payment of deferred offering costs of $1.4 million.

Net cash provided by financing activities for the six months ended June 30, 2020 was $30.6 million, which consisted primarily of net proceeds received from the sale and issuance of our Series B convertible preferred stock.

Contractual Obligations and Other Commitments

As of June 30, 2021, there have been no material changes from the contractual obligations and commitments previously disclosed in our Prospectus.

Off-Balance Sheet Arrangements

Since inception, we have not engaged in any off-balance sheet arrangements as defined in the rules and regulations of the SEC.



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Critical Accounting Policies and Estimates

Our management's discussion and analysis of the financial condition and results of operations is based on our financial statements, which have been prepared in accordance with the U.S. generally accepted accounting principles, or GAAP. The preparation of our financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, expenses and related disclosures. Our estimates are based on historical experience and on various other factors that are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

During the six months ended June 30, 2021, there were no material changes to our critical accounting policies or in the methodology used for estimates from those described in "Management's Discussion and Analysis of Financial Condition and Results of Operations" included in the Prospectus. The determination of the fair value of our common stock is used in estimating the fair value of stock-based awards at grant date. Prior to the IPO, our common stock was not publicly traded, therefore we estimated the fair value of our common stock as discussed in our Prospectus. Following our IPO, the closing sale price per share of our common stock as reported on the Nasdaq Global Select Market on the date of grant will be used to determine the exercise price per share of our share-based awards to purchase common stock.

Recent Accounting Pronouncements

See Note 2 to our unaudited interim condensed financial statements for more information about recent accounting pronouncements, the timing of their adoption, and our assessment, to the extent we have made one yet, of their potential impact on our financial condition of results of operations.

Emerging Growth Company and Smaller Reporting Company Status

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (JOBS Act). We will remain an emerging growth company until the earliest to occur of: (i) the last day of the fiscal year in which we have more than $1.07 billion in annual revenue; (ii) the date we qualify as a "large accelerated filer," with at least $700 million of equity securities held by non-affiliates; (iii) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period; and (iv) December 31, 2026.

The JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards, delaying the adoption of these accounting standards until they would apply to private companies. We have elected to use the extended transition period to enable us to comply with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date on which we (i) are no longer an emerging growth company and (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our financial statements may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates.

We are also a smaller reporting company, meaning that the market value of our stock held by non-affiliates is less than $700 million and our annual revenue was less than $100 million during the most recently completed fiscal year. We may continue to be a smaller reporting company if either (i) the market value of our stock held by non-affiliates is less than $250 million or (ii) our annual revenue is less than $100 million during the most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700 million.

If we are a smaller reporting company at the time we cease to be an emerging growth company, we may continue to rely on exemptions from certain disclosure requirements that are available to smaller reporting companies. Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth company's smaller reporting companies have reduced disclosure obligations regarding executive compensation.

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