Preferential differentiation of GATA-1-null ES cells into neutrophils. (A) Total number of day 14-induced cells from E14tg2a and GATA-1-null ES cells exposed to IL-3 since day 8. Error bars represent SEM. (B) FACS analysis of day 14-induced cells. The cells were stained with anti-c-KIT, GR-1, and MAC-1 antibodies. Antibody staining and IgG control staining were shown. (C) Giemsa staining of the day 14-induced cells. Bar represents 50 μm.