Fig. 7. RA requirement in pectoral fins after 28 hpf. (A-C) Alcian
Blue stains of larval pectoral fin and girdle at 6 (A,B) and 4,5 dpf (C).
Treatment with 10 µM DEAB from 10-17 hpf inhibits formation of the
scapulocoracoid (sco) (B), and from 28-50 hpf affects differentiation in the
proximal skeletal elements of the pectoral girdle (C). (D-G) In situ
hybridizations of pectoral fins at 50 hpf; differentiation of the fin
mesenchyme (D,E), appendicular muscles (F) and apical fold (G) appear
unchanged upon treatment with 10 µM DEAB. cl, cleithrum; ed, endoskeletal
disc.