Figure 6

A, B. Brightfield and fluorescence images of X. laevis cardiac actin promoter-GFP transgenic embryos.

C. Transgenic X. laevis gastrula expressing GFP under the control of an Xbra promoter element, assayed by in situ hybridization with a GFP probe.

D. Transgenic X. laevis tadpole expressing GFP driven by a neural-specific b -tubulin promoter.

E-G. Putative enhancer-trap lines showing highly regionalized expression of GFP (arrows) visualized by in situ hybridization with a GFP probe.

H, I. Transgenic S. tropicalis tadpole expressing cardiac actin promoter-GFP fusion construct, brightfield and fluorescence images, respectively. Arrow in I denotes GFP expression in somites. Area outlined in red in H shown in I.