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Fig. 9 The kcnk5a, kcnk5b, and kcnk17 gene (tandem of pore domains in a weak inward rectifying K+-related alkaline pH-activated K+ channel) expression during zebrafish embryogenesis. Whole-mount in situ hybridization of zebrafish embryos at stages 12 h postfertilization (hpf) (A, E, I, M, Q, and U), 24 hpf (B, F, J, N, R, and V), 48 hpf (C, G, K, O, S, and W), and 72 hpf (D, H, L, P, T, and X). The anterior is to the left in all the whole-mount images, and the dorsal is to the top in all transverse sections. The section images were shown in the insert of corresponding panels (B, G, J, K, and N), or on the left side (D′). (A–D) Lateral view of gene expression of kcnk5a. The gut is labeled with orange dashed lines in panel D′. (E–H) Dorsal view of gene expression of kcnk5a. (I–L) Lateral view of gene expression of kcnk5b. (M–P) Dorsal view of gene expression of kcnk5b. (Q–T) Lateral view of gene expression of kcnk17. (U–X) Dorsal view of gene expression of kcnk17. The white dashed lines indicate the positions of sections. The section images were shown in the insert of corresponding panels. Scale bars were added on the bottom row of images; 250 μm for whole-mount images. cmz, ciliary marginal zones; e, eye; fb, forebrain; gut, gut; hb, hindbrain; len, lens; mb, midbrain; n, neural tube; nt, notochord; op, optic vesicles; ov, otic vesicles; pa, pharyngeal arches; pf, pectoral fins; tb, tail bud.