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Fig. 4. Transverse sections of myotomal muscle from wild-caught Arctic charr Salvelinus alpinus from Thingvallavatn. All sections were stained with the S-58 anti-slow muscle myosin antibody and counterstained with Haematoxylin. The slow muscle fibres (s) stain red and the fast muscle fibres (f) are unstained. (A) Large benthic morph, 8.0 cm FL. The arrowheads show a zone of small diameter slow fibres adjacent to the fast muscle layer representing a region of stratified hyperplasia. (B) Planktiverous morph, 20.6 cm FL. The arrowhead shows an isolated small diameter fibre within the slow muscle layer. (C,D). Piscivorous morphs, 35.8 cm FL (C) and 50.6 cm (D). The arrowheads show an isolated small diameter fibre within the slow muscle layer. All scale bars, 100 µm. f, fast muscle fibre; s, slow muscle fibre.





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