we used in vitro cultures of highly enriched hematopoietic progenitor cells stimulated by natural and recombinant growth factors to investigate the biologic effects of tgf beta 1 and tgf beta 2 on erythroid ( cfu-e and burst-forming unit ( bfu ) -e ) , granulocyte-macrophage ( cfu-gm ) and multilineage ( i.e. , granulocyte , erythroid , macrophage , and megakaryocyte ; cfu-gemm ) colony-forming cells .
C0018956
hematopoietic progenitor
C0007634
cells