The effect of erythrocytes on mouse bone marrow colony development in vitro.

The development of colonies in nutrient rabbit, red cells exhibited enhancing agar in vitro from mouse hemopoietic ability, as did osmotically lysed erythrocells, in the presence of a maximal dose cyte preparations from rats. The use of of colony-stimulating activity (CSA), was red cells in the culture system, in addigreatly enhanced by the addition of lion to a maximum concentration of CSA, washed red cells to the culture system. has resulted in revised estimates of the Human, sheep, guinea pig, rat, and numbers of agar colony-forming units in mouse (syngeneic or allogeneic), but not hemopoietic tissues.