CFU-C numbers and vascular hematopoietic clusters in Gata2−/− embryos. CFU-C numbers per ee found in (A) E9 and E10 AGM, (B) E9 and E10 VA+UA, (C) E9 and E10 YS, and (D) E10 placenta. *P < .05; **P < .01. (E) Quantitation of cKit+ hematopoietic cluster cells in VA+UA of E10 Gata2+/+, Gata2+/−, and Gata2−/− embryos. (F) Representative whole mount images of hematopoietic cluster cells in the VA of E10 Gata2+/+ (30 sp), Gata2+/− (31 sp), and Gata2−/− (30 sp) embryos stained for cKit expression.