Both scl isoforms partially rescue runx1 but not ephrinb2a expression in SU5416-treated embryos. (A-H) runx1 and ephrinb2a expression in control (0.2% DMSO; A,E), control (2μM SU5416; B,F), scl-α mRNA (2μM SU5416; C,G) and scl-β mRNA (2μM SU5416; D,H). (A-D) runx1 expression in the ventral wall of the DA (arrowheads) at 30 hpf. (E-H) ephrinb2a expression in the DA (arrowheads) at 30 hpf.