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American Zoologist 1973 13(2):435-445; doi:10.1093/icb/13.2.435
© 1973 by The Society for Integrative and Comparative Biology
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Glycogen in Crustacean Fast and Slow Muscles

WALTER A. MORIN and ELAINE McLAUGHLIN
Department of Biological Sciences, Bridgewater State College Bridgewater, Massachusetts 02324

Ultrastructural examination of crayfish superficial (tonic) and deep (phasic) abdominal extensor muscles reveals a distribution and quantitative difference in glycogen between these muscles. Both superficial and deep fibers have a dense accumulation of glycogen in the interfibrillar sarcoplasm. In addition, the superficial extensors, but not the deep extensors, contain glycogen in the I band region. The glycogen granules are of the ß type and can be removed enzymatically. The superficial medial and lateral fibers contain more glycogen than the medial and lateral deep fibers. A possible functional role for this difference is suggested.


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