Fig. 11. The nuclear content of isolated muscle fibres. (A) A fast muscle fibre stained with the fluorescent DNA stain Sytox green. The confocal image represents a projection of 1 µm sections through the fibre. (B) The number of myonuclei in single muscle fibres of 1 cm length in relation to muscle fibre diameter. Open circles represent the ambient group and filled circles represent the heated group. The lines represent linear regressions (see text for details).