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Fig. 4. Expression of VEGFR2 in wild-type (A,C) and Vegflo/lo (B,D) embryos at 9.0 dpc. Sections are derived from whole-mount in situ hybridisation with a VEGFR2 probe. Transverse sections show VEGFR2 expression in the endocardium (enc) and the cardinal vein (cv) in Vegflo/lo embryos (B) and in the endothelial cells lining one of the rare blood islands (bl; D).