Expression of klf2aand klf2b in the zebrafish gastrula.

Whole-mount in situ hybridization of zebrafish embryos with riboprobes for the zebrafish klf2a (A-D) and klf2b genes (E-H). The embryos are shown in lateral view (A,E,C,G) with animal pole to the top and dorsal to the right, and in animal pole view (B,F,D,H) with dorsal to the right. Embryos in panels A, B, E, and F are at 70% epiboly and those in C, D, G, and H are at 90% epiboly. The gastrula margin is indicated with small arrowheads (A,E,C,G), and theklf2b-expressing cells on this margin are indicated with an arrow (E,G). Original magnification 50 ×; stained with NBT/BCIP precipitate.