here , we investigated the expression of class ii determinants on hpc responsible for the sustained proliferation of colony-forming units of granulocyte/macrophage ( cfu-gm ) , of multilineage hpc ( cfu-gemm , granulocyte/erythrocyte/macrophage/megakaryocyte ) , and burst-forming units of erythroid cells ( bfu-e ) in liquid long-term cultures .
C0018956
hpc
C0007634
cells