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  • Title: The fenestrated collar of mammalian cardiac sarcoplasmic reticulum: a freeze-fracture study.
    Author: Van Winkle WB.
    Journal: Am J Anat; 1977 Jun; 149(2):277-82. PubMed ID: 879047.
    Abstract:
    Freeze-fracture studies of papillary muscles from cat, rabbit and dog reveal the presence of a fenestrated collar of the sarcoplasmic reticulum (SR) in the region of the M band. This membrane specialization is structurally similar to that observed previously in skeletal muscle. This report includes mammalian cardiac muscle on the list of those muscles containing this SR membrane structure.
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