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Any cellular projection surrounding a cylindrical shaft containing a bundle of eleven microtubules, nine of which form a circle around the central pair, while the cortical microtubules are doublets. Cilia and flagellae (q.v.) are examples. Mastigote protoctists possess undulipodia; amastigote protoctists do not. See axoneme, Rhizopoda.

Subjects: Biological Sciences.

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