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In the transgenic zebrafish line Tg(fli1:EGFP)y1, the promoter for the endothelial marker fli1 drives the specific expression of EGFP in blood vessels. This allows the visualization, and hence the analysis of the vasculature during zebrafish embryonic development (A, Lawson and Weinstein, 2002a), and during adult vessel regeneration upon tail fin amputation (B, Huang et al., 2003). Scale bar represents 500 μm in (A), and 1 mm in (B).
