JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Skeletal muscle fibres in cross section, light micrograph. The dotted appearance is due to myofibrils composed of bundles of myosin and actin filaments. The nuclei are displaced to the periphery of the muscle cell. Magnification: x900 when printed at 10 centimetres wide.
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