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Rb-null erythroid progenitors do not show increased rates of proliferation. (A) Representative FACS profiles and mean numbers of CD71high/Ter-119high BM erythroblasts in S phase, labeled in vivo with BrdU and stained with 7-AAD. (B,C) Cell cycle distribution summary of CD71high/Ter-119high fraction of cells from the BM (B) and the spleen (C) (n = 3).
