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Microtubules tend to be of a helical structure, do microtubules in centrioles also have a helical structure?

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The centriole is composed of nine circularly arranged triplet microtubules, one complete microtubule (the A-tubule) onto which two additional partial microtubules are assembled (the B- and the C-tubules, respectively. )

What are the structures of A, B and C respectively, are they helical?

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