Evi1^KI/+ mice show low platelet count and delayed leukocyte and platelet recovery from FU treatment. The peripheral blood cells of Evi1^+/+ and Evi1^KI/+ age- and sex-matched littermates after FU administration (Evi1^+/+, n = 7 vs Evi1^KI/+, n = 7). The platelet and leukocyte count recovery of Evi1^KI/+ mice was slow and delayed. Platelet count rebound of Evi1^KI/+ mice was milder than that of Evi1^+/+ mice. Values are the mean ± SEM of each group. Threshold significance level, P = .05 (2-tailed Welch t test).