CXCR4 and Decreased total leukocyte count: While CXCR4 antagonism corrected peripheral blood leukopenia in Cxcr4+/1013 mice (Figures 1B–E), it did not appear to affect the count of red blood cells or platelets in both Cxcr4+/1013 and WT mice (Supplementary Figures S2A, B).