Fig. 3

Hematoxylin-eosin staining of pectoral fin buds and early larval fins. Cross-sections of pectoral fin buds and early larval fins stained with hematoxylin and eosin (a, b, c, e) and magnified images (d, f) at the eye pigmentation stage (a; n = 1), middle-pec stage (b; n = 1), long-pec stage (c, d; n = 1), and long fin-fold stage (e, f; n = 1). at, apical thickening; af, apical fin fold; cc, chondrogenic condensation; dmm, dorsal muscle mass; ed., endoskeletal disc; vmm, ventral muscle mass; pec, pectoral fin. Scale bars, 10 μm