Cellular interactions in haematopoiesis

Abstract
In vitro culture of hematopoietic cells has provided some surprising insights into critical interactions of blood-forming cells. Subpopulations of lymphoid cells produce colony-stimulating activity, interact with macrophages, and have important effects on the very early stages of erythropoiesis. Macrophages have multiple influences on the proliferation and differentiation of other hematopoietic cells.