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Fig. 6. Transverse sections of fast myotomal muscle from Arctic charr stained with
S-58 antibody and counterstained with HaematoxylinEosin. (A). Dwarf
benthic morph, 25.7 cm FL, showing the absence of fast muscle fibres
less than 20 µm diameter. The smallest diameter fibre is labelled (a). (B)
Piscivorous morph, 35.8 cm FL, showing the mosaic pattern of muscle
fibre diameters indicating recent recruitment. The fibres labelled (a) and (b)
are 14 and 18 µm diameter, respectively. Filled arrowheads, muscle nuclei;
unfilled arrowheads, connective tissue nuclei. Scale bars, 100 µm. c,
capillary.