Endothelial survival is compromised in reh mutants owing to increased apoptosis by 36 hpf. (A-D) Confocal projections of Tg(kdrl:gfp) wild-type (wt) and reh mutant zebrafish that were TUNEL stained (red) reveal that (D) reh endothelial cells exhibit increased apoptosis at 36 hpf when compared with (C) wild-type endothelial cells. However, there appeared to be no significant difference in endothelial cell death between (A) wild-type and (B) reh embryos at 28 hpf. (E,F) The number of apoptotic cells observed per high-power field for each condition. Mean+s.e.m. Student’s t-test, *P<0.1 (n=15 reh and wild-type zebrafish).
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