Expression patterns of robo4 in development. A montage of robo4 whole-mount in situ staining is shown, with 16 (A), 19 (B), 20 (C), 23 (D), 24 (E), and 20 (F) som. (G) High power of F.(H) High power of I.(I) A 22-som telencephalon (t), hindbrain (hb), and neural tube (nt). J is 28-29 hpf. Arrowhead in G indicates expression in angioblasts; asterisk in H shows ISV expression. robo4 (K), G-RCFP (L), DAPI (M), and merge (N) show two-color staining of frozen 20-μm anterior trunk sections of vegfr2-G-RCFP 25-hpf embryos. The arrowhead and asterisk in K-N indicate ISV and axial vessels, respectively. Images were taken with a x20 (A-E), x10 (F, I, and J), x40 (G and H), and x20 (K-N) lens with x2.5 zoom.
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