Hoxa7-andHoxa9-deficient mice exhibit quantitative reductions inthe frequency of phenotypically defined hematopoietic progenitors. (A) Analysis of adult bone marrow for phenotypically defined populations of HSCs/MPPs and early progenitors (CLPs, CMPs, GMPs, MEPs). Horizontal lines indicate the mean frequencies for specific progenitors. ^*P < .01; ^**P < .001. (B) Analysis of B-cell (left panel) and T-cell (right panel) progenitors from bone marrow and thymus, respectively. ^*P < .01; ^**P < .001. Error bars indicate SD.