Fig. 1. Activity of jef is essential for development of many cartilages. (A,E,I,M, lateral views, anterior towards the left; B,F,J,N, ventral views, anterior towards the left; C,G,K,O, dissected pharyngeal cartilages stained with Alcian, anterior towards the left; D,H,L,P, Alcian stained right pectoral and fin skeletons, anterior towards the top. (A-D) Wild type; (E-H) homozygous jef^tw37; (I-L) homozygous jef^hi1134; (M-P) heterozygous jef^tw37/jef^hi1134. All animals are 5 dpf. bh, basihyal; bsr, branchiostegal rays; cb, ceratobranchials; ch, ceratohyal; ch?, presumed ceratohyal; cl, cleithrum; ed, endoskeletal disk; co, scapulocoracoid; hs, hyosymplectic; m, Meckel's cartilage; m/de? putative Meckel's cartilage and dentary bone; op, opercule; pq, palatoquadrate. Scale bars: 100 µm in O for C,G,K,O; 100 µm in P for D,H,L,P.