fetal hepatic bfu-e , unlike adult bone marrow ( bm ) or peripheral blood ( pb ) bfu-e , were capable of proliferating in response to erythropoietin in the absence of added gm colony-stimulating factor ( gm-csf ) or interleukin-3 ( il-3 ) , and erythropoietin ( epo ) directly stimulated the expansion of the fetal bfu-e pool in suspension culture .
C0005953
bone marrow
C0009392
colony-stimulating