Transplantation studies. EPAS1/HIF-2α null recipients. (A) Spun hemat ocrits or (B) complete blood cell count results for leukocytes (WBC), erythrocytes (RBC), and platelets (PLT) 30 days after transplantation in recipient EPAS1/HIF-2α null (▪) or wild-type littermate (□) mice. Differences were all significant for P < .05 (spun hematocrits, red blood cell counts, and white blood cell counts) or P < .10 (platelets) as assessed by one-tailed t test or by χ² test. Error bars indicate SEM.