[Effect of antibodies to denatured DNA on the human bone marrow cells forming colonies in semi-solid agar]

gamma-globulin from rabbit sera containing antibodies to denatured DNA or cytidine suppressed the efficiency of colony formation in agar cultures of human bone marrow cells. The antibodies to DNA isolated from the immune sera by the immunosorbent produced an analogous effect. gamma-globulin from the sera of intact animals and immune sera after the removal of antibodies to denatured DNA from them produced a different effect. gamma-globulin in a concentration of 0.28 and 5 mg failed to influence the colony-formation of 2.10(5) explanted nucleus-containing cells, by stimulated the colony growth when added in a concentration of 15 mg.