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Fig. 8. Junction formation and arterial endothelial cell differentiation in
endodermless embryos. Transverse sections of endodermless embryos.
Tg(flk1:EGFP)s843;cas mutants visualized for: (A-C) GFP
(green), filamentous actin (blue) and ZO1 (red); and (D-F) GFP (green) ephrin
B2 (red) and ß-catenin (blue). The sections shown are at the level of the
6th (A,D), 10th (B,E), and 14th somites (C,F). The outlined areas are
magnified and shown with schematic drawings. Despite the absence of endoderm,
differentiation of angioblasts into arterial and venous endothelial cells
occurs as in wild-type embryos. NT, neural tube; NC, notochord; DA, dorsal
aorta; PCV, posterior cardinal vein.