Erythroid cells are found in
multilineage colonies, CFU-GEMM, which
include granulocytes, macrophages and
megakaryocytes. The first truly committed
erythrocyte progenitor is a cell lineage
called burst-forming unit-erythroid (BFU-E).
The later stage, colony-forming uniterythroid
(CFU-E), is a more mature cell and
differentiates into proerythroblasts and