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‘Square arrays’ in the sarcolemma of human skeletal muscle fibres

Abstract

Fast twitch fibres of rat1 and rabbit2 show rectangular patterns of intramembrane particles in freeze-fracture preparations of the sarcolemma. These ‘square arrays’ are almost totally absent in the slow twitch soleus muscle of rat1. I report here differences in the incidence of square arrays in human fetal and adult muscle and in different fibres within a human muscle. Square arrays probably classify fast and slow twitch fibres in freeze-fracture preparations of mixed muscles.

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Schmalbruch, H. ‘Square arrays’ in the sarcolemma of human skeletal muscle fibres. Nature 281, 145–146 (1979). https://doi.org/10.1038/281145a0

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