c-kit signaling is not required for primitive erythropoiesis in mice. (A) Average number of primitive RBCs in individual E11.5 littermates generated from Kit^W/+ intercrosses (Kit^+/+, n = 3, Kit^W/+, n = 7; Kit^W/W, n = 5). Error bars show the SEM. (C-D) Wright-Giemsa–stained blood collected from Kit^+/+ (B) and Kit^W/W (C) embryos. Arrows point to leukocytes, remaining cells are erythrocytes.