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[Effect of thymectomy and syngeneic thymocytes on colony formation by hematopoietic precursor cells in the peritoneal cavity].

The influence of the T-system of immunity on the processes of the proliferation and differentiation of hemopoietic precursor cells outside the organs of the hemopoietic and lymphoid systems has been studied. Thymocytes have been found to regulate the formation of hemopoietic foci in the peritoneal cavity. The effects of the stimulation and suppression of colony formation, as well as the degree of their manifestation, depend on the initial level of the colonies. The thymectomy of the recipients or donors of hemopoietic cells leads to the increase of colony formation. Syngeneic thymocytes abolish the effect of thymectomy.