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. Author manuscript; available in PMC: 2010 Mar 9.
Published in final edited form as: Curr Opin Cell Biol. 2009 Feb 3;21(1):14–19. doi: 10.1016/j.ceb.2009.01.008

Figure 2.

Figure 2

Proposed evolution of a proto-centriole capable of nucleating a primitive cilium-like structure. (A) Evolution of tektins allows formation of stable microtubule doublet and triplet structures. (B) Acquisition of one or more appendage proteins allows docking of proto-centriole onto cell cortex. (C) Microtubules can extend from the end of the double structure. (D) If microtubules extend from the end of a docked doublet it would produce a primitive cilium-like structure that could be used for sensory or gliding functions.