Flow cytometric analysis of myeloid progenitor cells in wild-type, IRF-4 KO, IRF-8 KO, and IRF-4/8 DKO mice. (A) Numbers in boxed area indicate percent of GMPs in total myeloid progenitor cells. (B) Statistical analysis of the frequency of GMPs in total myeloid progenitor cells. (C) Statistical analysis of the absolute number of GMPs in total BM cells isolated from both hind limbs.