A cellular projection whose structure and functions differ from the bacterial flagellar apparatus. Motile cilia can move fluid; a transport estimate must compare advection with diffusion.
A eukaryotic cilium contains an organized microtubule-based core. Motile forms use dynein-dependent sliding and bending, while many nonmotile primary cilia participate in sensing. These functions distinguish cilia from the rotary filament of a bacterial flagellum. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 16, Cilia and Flagella
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