medium conditioned by b cells ( cm ) from the circulation or bone marrow stimulates the formation of erythroid bursts , granulocyte-macrophage colonies , and mixed colonies containing granulocytes , erythroblasts , monocytes , and megakaryocytes ( gemm ) in serum-free cultures of allogeneic and autologous marrow ( p less than 0.05 ) .
C0005953
bone marrow
C0025166
megakaryocytes