An axoneme, also called an axial filament is the microtubule-based cytoskeletal structure that forms the core of a cilium or flagellum. Cilia and flagella are found on many cells, organisms, and microorganisms, to provide motility.The axoneme serves as the "skeleton" of these organelles, both giving support to the structure and, in some cases, the ability to bend. More @Wikipedia
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