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In a centriole, each "arm" (a triplet microtubule) is attached from its A-tubule to the C-tubule of the adjacent arm. What is the type of fiber that connects each arm ("connecting fibrils" in the image below)?

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Winey M, O'Toole E. 2014. Centriole structure. Phil Trans R Soc B 369:20130457

Cross-sectional images of centrioles and basal bodies show a linker between the A- and C-tubules in many different organisms... Surprisingly, candidate molecules serving as constituents of these linkers have not yet been identified.

That's as of 2014. I don't have the time right now, but I'll try at some point to find if there are more recent developments.

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