Fig. 1. Embryonic expression patterns. A,C,D,G,I,K,L, sox9a; B,E,F,H,J,M,N, sox9b. (A,B) 14 hpf, dorsal view. (C,F) Cross-sections of 14 hpf embryos at anterior-posterior level indicated by black bars in A and B. (D,E) Lateral views of 26 hpf embryos. (G,H) Lateral view, 48 hpf. (I,J) Pectoral fin bud at 68 hpf. (K-N) High (K,N) and low (L,M) magnification of sections of 68 hpf embryos through the arches. Abbreviations: co, scapulocoracoid; f, forebrain; fb, fin bud; e, eye; ed, endochondral disc; hb, hindbrain; m, midbrain; mhb, midbrain-hindbrain boundary; nc, neural crest; ov, otic vesicle; pa, pharyngeal arches; pcp, prechordal plate; r, rhombomeres; s, somites; t, tectum. Scale bars: in N, 50 µm for K,N; in B, 100 µm for A,B; in F, 100 µm for C-F; in H, 100 µm for G,H; in J, 100 µm for I,J; in M, 100 µm for L,M; in N, 100 µm for K,N.