Figure 427 from Chapter 16 (Cytoplasmic matrix and cytoskeleton) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Papillary muscle of cat heart shows the cross-banded organization of striated muscle. Myosin filaments compose the uniform dark A bands. The lighter I bands of actin filaments are bisected by the dense Z line. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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