| Type | MGI:General | Description | erythroid progenitors from bone marrow form ~50% fewer erythroid burst-forming units (BFU-E) and colony-forming units (CFU-E) in culture than control cells, whereas erythroid progenitors from the spleen form more BFU-E and CFU-E there are fewer CD71+ immature erythroid progenitors in the bone marrow, and a higher percentage of CD71+ /Ter119+ double positive cells in the spleen |