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Fig. S2
Apoptosis does not contribute to changes in arterial endothelial cell number in alk1-deficient embryos. 2D confocal projections of 50 µm vibratome sections of 30 hpf control- (N = 8) and alk1-morphant (N = 9) Tg(kdrl:NLS-mCherry)is4 embryos, stained for apoptotic cells via TUNEL. Aortic arch 1 (AA1) and internal carotid artery (ICA) are traced for clarity. No apoptotic cells were detected in AA1, ICA or CaDI. Dorsal view, anterior down. Scale bar, 50 µm.
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