Summary
Individual muscle fibres were separated from freeze-dried needle biopsies and classed as type I or type II fibres according to their myofibrillar ATP-ase. Portions of the same fibres were processed for electron microscopy and their fine structure examined. Type I fibres were found to have thicker Z-bands and more mitochondria and lipid droplets than the type II fibres.
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Wroblewski, R., Jansson, E. Fine structure of single fibres of human skeletal muscle. Cell Tissue Res. 161, 471–476 (1975). https://doi.org/10.1007/BF00224137
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DOI: https://doi.org/10.1007/BF00224137