slc39a5 morphants have delayed CVP development. (a–g) Representative images of the caudal region in control and slc39a5 morphant embryos captured using dual-fluorescence microscopy at 32 hpf (a), 38 hpf (d) and 42 hpf (g). The numbers of endothelial sprouts and capillary loops in the CVP were measured at 32 hpf (b–c), 38 hpf (e–f) and 42 hpf (h–i). (j–l) Representative images of the CVP in control Tg(fli1a:eGFP) embryos and Tg(fli1a:eGFP) embryos injected with the slc39a5 morpholino alone or co-injected with the slc39a5 morpholino and a morpholino-resistant slc39a5 mRNA. The numbers of endothelial sprouts (k) and capillary loops (l) in the CVP were measured at 32 hpf. *p < 0.05, ***p < 0.001 and n.s., not significant.
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