crude cm was assayed for hemopoietic progenitor cell growth-stimulating activity ( hp-gsa ) in plasma clot cultures of 10 ( 5 ) c57b1/6j mouse bone marrow cells or 10 ( 5 ) light-density , nonadherent human peripheral blood mononuclear cells .
C0018956
hemopoietic progenitor cell
C0007634
cells