Therapeutic Solutions International, Inc. announced a patent filing covering the unanticipated finding that neutrophils, a type of white blood cell, when manufactured in a specific manner, are capable of stopping unwanted immune responses while allowing the body to fight bacteria and viruses. Classical immunology doctrine teaches that these cells act as "first responders" but not as "leader cells", a function which has been classically ascribed to T helper cells. In a series of experiments, it was found that neutrophils generated from hematopoietic stem cells in the presence of an immunological messenger molecule named IL-10, could potently block rejection responses when these cells were administered in different strains of mice.

Importantly the injected cells allow other cells from the same donor to not be rejected, allowing for transplantation of therapeutic cells.