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Simplistic overview of cilia structure and types. Structurally, the cilium consists of four main parts,(1) the basal body, (2) the transition zone, (3) the axoneme, and (4) the ciliary membrane. Furthermore, there are two main types of cilium: (1) motile cilium, containing 9 outer microtubules (MTs) doublets and one pair of MT at its center, and (2) nonmotile cilium, which has 9 outer MT doublets but lacks the central MT pair.
