the range of specificity of the cfu-s proliferation inhibitor and stimulator which are produced endogenously in the bone marrow has been investigated by measuring their effects on the proportion of cells killed by tritiated thymidine in mixed colony- ( cfc-mix ) , erythroid burst- ( bfu-e ) and granulocyte/macrophage colony- ( gm-cfc ) forming cells as well as spleen colony forming units ( cfu-s ) .
C0005953
bone marrow
C0018183
colony