Blood cell counts in the murine eosinophilic disease model induced by the F/P fusion gene. Mice that received a transplant of nontransgenic (Tg), mock-transduced (non–Tg-mock); IL-5Tg, mock-transduced (IL-5Tg-mock); non-Tg, F/P-transduced (non–Tg-F/P); and IL-5Tg, F/P-transduced (IL-5Tg-F/P) HSCs/Ps were analyzed at 4 weeks after transplantation. Automated total cell leukocyte (A) and eosinophil (B) counts assessed by Discombe staining were performed. Data are shown as mean ± SD and represent 10 to 12 mice per group, pooled from 3 independent experiments. *P < .05 and **P < .01, compared with non–Tg-mock; ##P < .01, compared with IL-5Tg-mock.