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.