Resting hematopoiesis is normal in BMP4 hypomorphs. (A) The total number of nucleated bone marrow cells per femur in 8- to 12-week-old WT (n = 14) and BMP4 (n = 15) hypomorphs is not significantly different. (B) Hematopoietic lineage analysis in WT (n = 11) and BMP4 (n = 16) hypomorphs. The fractions of B cells (B220⁺), red blood cell progenitors (Ter119⁺), and myelomonocytic cells (Mac1/Gr1⁺) within the CD45⁺ BM population are shown. Error bars show SEM.