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Whole-mount 5-bromo-4-chloro-3-indolyl β-d-galactopyranoside-stained embryos at E11.5. (a) An embryo transgenic for the construct HH− shows the reduced staining, as described (4). (b) An embryo transgenic for the construct HHNS shows specific staining in virtually all vessels. TG, number of transgenic embryos analyzed; ES, number showing the endothelial-specific staining shown in the respective picture; ET, number showing ectopic staining; NO, number showing no staining at all.
