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Fig. 7 The kcnk2a, kcnk2b, kcnk4a, kcnk4b, kcnk10a, and kcnk10b gene (tandem of pore domains in a weak inward rectifying K+-related K+ channel [TREK]) expression during zebrafish embryogenesis. Whole-mount in situ hybridization of zebrafish embryos at stages 12 h postfertilization (hpf) (A, E, I, M, Q, U, Y, DD, HH, LL, PP, and TT), 24 hpf (B, F, J, N, R, V, Z, EE, II, MM, QQ, and UU), 36 hpf (AA–AA”); 48 hpf (C, G, K, O, S, W, BB, FF, JJ, NN, RR, and VV), and 72 hpf (D, H, L, P, T, X, CC, GG, KK, OO, SS, and WW). The anterior is to the left in all the whole-mount images, and the dorsal is to the top in all transverse sections (B′, F′, J′, N′, O′, R′, V′, W′, AA′′, FF′, GG′, II′, MM', NN', QQ', UU', V and V'). (A–D) Lateral view of gene expression of kcnk2a. (E–H) Dorsal view of gene expression of kcnk2a. (I–L) Lateral view of gene expression of kcnk2b. (M–P) Dorsal view of gene expression of kcnk2b. (Q–T) Lateral view of gene expression of kcnk4a. (U–X) Dorsal view of gene expression of kcnk4a. (Y–CC) Lateral view of gene expression of kcnk4b. (DD–GG) Dorsal view of gene expression of kcnk4b. (HH–KK) Lateral view of gene expression of kcnk10a. (LL–OO) Dorsal view of gene expression of kcnk10a. (PP–SS) Lateral view of gene expression of kcnk10b. (TT–WW) Dorsal view of gene expression of kcnk10b. The white dashed lines indicate the positions of sections. The letters below or around the dashed lines correspond to the section panels. Scale bars were added on the bottom row of images; 250 μm for whole-mount images. allg, anterior lateral line ganglia; ce, cerebellum; cf, caudal fin fold; cmz, ciliary marginal zones; e, eye; hb, hindbrain; mb, midbrain; n, neural tube; nt, notochord; op, optic vesicles; ov, otic vesicles; p, pallium; pa, pharyngeal arches; pf, pectoral fin; pllg, posterior lateral line ganglia; re, retina; so, somites; sp, subpallium; tb, tail bud; tec, tectum; thal, thalamus; thy, thyroid gland; trig, trigeminal ganglia.