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Microtubules

Hollow, cylindrical cytoskeletal structures composed of tubulin.

Dynamic tubulin polymers that support cell shape, intracellular transport, mitotic spindle formation, and ciliary/flagellar motion.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Dynamic tubulin polymers that support cell shape, intracellular transport, mitotic spindle formation, and ciliary/flagellar motion.

Cytoskeleton, Microfilament