[Effect of thymosin on formation of splenic exocolonies in allogeneic and syngeneic systems].

It has been shown that thymosin promotes the growth of exocolonies both in the allogeneic and syngeneic systems provided the donor's bone marrow cells were incubated preliminarily in thymosin solution. It is assumed that not only thymocytes but also the humoral factor of the thymus play an important role in colony formation.