Growth of haematopoietic cells of mouse fetal liver in diffusion chambers

Growth of haematopoietic cells from fetal mouse liver of 14- to 16- day gestation was studied with the diffusion chamber technique. The culture period varied from 1 to 8 days. Cell proliferation and haemoglobin synthesis were seen in erythroblasts during the first days of culture. However, the nearly pure erythroblastic population of the primary inoculum changed to vigorously growing granulocytic cells and macrophages during the 8-day assay period. It seems likely that end-product inhibition is operative within the monocyte-macrophage and granulocyte cell lineages, respectively, when cells grow in diffusion chambers in vivo.