Fig. 1. Expression of fast myosin heavy chain (MyHC; A,D,G), fast myosin binding protein C (B,E,H), and fast tropomyosin (C,F,I) in trout larvae. Transverse sections through the myotome at 27 (A–C), 41 (D–F) and 50 (G–I) days post-fertilisation. Fast isoform transcripts initially present throughout the whole fast muscle mass (A–C) become confined to the edges of adjacent myotomes (D–I). Scale bars, 200 µm.