Which of the following statements regarding cilia is not correct -

1. A. The organized beating of cilia is controlled by fluxes of Ca 2+ across the membrane
2. B. Cilia are hair-like cellular appendages
3. C. Microtubules of cilia are composed of tubulin
4. D. Cilin contain an outer ring of nine doublet microtubules surrounding two single microtubules

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