Expression of vascular marker genes in y11 mutants at 14 hpf (approximately 10 somite stage). Panels show whole mount in situ hybridization of 14 hpf wild type siblings (A–D) and y11 mutants (E–H) probed for flk1 (A,E), flt4 (B,F,I), vecdn (C,G), and plxnd1 (D,H). The developing trunk region imaged in panels A–H is noted by the box on the whole flt4-stained wild type embryo in panel I. Rostral is up in all panels. Scale bar = 200 μm (A–H).