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microtubule
(mi″kro-too´būl)
any of the slender, tubular structures, composed chiefly of tubulin, found in the cytoplasmic ground substance of nearly all
cells; they are involved in maintenance of cell shape and in the movements of organelles and inclusions, and form the spindle
fibers of mitosis.
Microtubules in a 9 + 2 array in a cross-section of the central core of a cilium.

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