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A schematic demonstrating the ontogeny of primitive and definitive erythroid cells from the earliest stem or progenitor cells that give rise to these lineages to more differentiated erythroid progenitors (ery. prog.) that then undergo maturation to give rise to mature erythrocytes (McGrath and Palis 2008, Sankaran, et al 2009). This scheme is shown in panel A. The various globin genes in mouse and humans that are expressed at each corresponding stage are shown below in panel B.
