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Figure Caption
Fig. S3 Changes in fli1 expression in embryos with altered Hh signaling. (A-C) In situ hybridization detects expression of the endothelial gene fli1 at the 16-somite stage. Dorsal views, anterior towards the top. Scale bar: 100 μm. (A,B) A subset of anterior endothelial progenitors (arrowheads) appears subtly expanded in CyA-treated embryos. (C) Loss of some anterior endothelial progenitors (arrowheads) is evident in shh-injected embryos.
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