scl-α but not scl-β partially rescues both endothelial and HSC marker expression in etsrp morphants. (A-D) Fluorescent images of flk1-GFP at 30 hpf in control (A), etsrp MO (B), etsrp MO + scl-α mRNA (C), and etsrp MO + scl-β mRNA (D). Arrowheads denote axial vessels, and arrows denote ISVs (A,C). (E-L) runx1 and c-myb expression in control (E,I), etsrp MO (F,J), etsrp MO + scl-α mRNA (G,K), and etsrp MO + scl-β mRNA (H,L). (E-H) runx1 expression in the ventral wall of the DA (arrowheads) at 30 hpf. (I-L) c-myb expression in the ventral wall of the DA (arrowheads) at 40 hpf.