Microtubules in mammalian heart muscle.

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Abstract
Sections of adult mammalian [dog, cat, guinea pig, rat] cardiac muscles fixed at room temperature revealed numerous microtubules (24-28 nm in diameter) near the nucleus and in the extra-myofibrillar space. Microtubules encircled the nucleus, were associated with the myofibrils in a helical arrangement and formed a network running transversely at the level of the I band and axially between the myofibrils. Microtubules were more numerous in muscle cells than previously recognized and may perform more than a cytoskeletal function.