Fig. 4
Overexpression of hand2 causes outflow tract expansion. (A-H) MF20 antibody staining (red) and mef2cb in situ hybridization (green) at 36hpf in (A,B) nontransgenic, (C,D) Tg(hsp70:hand2), (E,F) Tg(hsp70:hand2P) and (G,H) Tg(hsp70:hand2AA) embryos, all of which were heat-shocked at 10hpf. Frontal views; (A,C,E,G) partial reconstructions of confocal z-stacks with arrows indicating outflow tract; (B,D,F,H) single slices with brackets marking outflow tract. Embryos overexpressing hand2 (C,D) or hand2 AA (G,H) exhibit expanded populations of mef2cb-expressing cells, whereas embryos overexpressing hand2 P (E,F) do not.