RBC parameters in WEPO mice. RBC counts (A), hematocrit (B), and MCV (C) were compared in 2-day-old wild-type (c-Kit^W/+) and mutant mice (c-KitW/W) and in adult EPO-tg, wild-type (c-Kit^W/+), and various c-Kit mutant mice (c-KitW/Wv, WEPO, and Vickid). For RBC and MCV values, mice were analyzed as follows: 2-day-old: wild-type (n = 8), c-Kit^W/W (n = 7); adult: EPO-tg (n = 6), wild-type (n = 16), c-Kit^W/Wv (n = 4), WEPO (n = 7), and Vickid (n = 6). For hematocrit values, mice were analyzed as follows: 2-day-old: wild-type (n = 7), c-Kit^W/W (n = 7); adult: EPO-tg (n = 55), wild-type (n = 16), c-Kit^W/Wv (n = 9), WEPO (n = 17), and Vickid (n = 7).