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of course there are spirochaetes, is that at all related? How do their flagella get arranged in helices?

A relationship between the curvature at the poles of rod-shaped bacteria and the helical shape of spirochetes is not self-evident at this time, being that the two represent different scales of size. Caulobacter, not nealry as curvaceous as spirochetes, owes its shape to a cytoskeletal protein called crescentin, but this does not necessarily deny a role for lipids arrangements in their morphogenesis. The helicity of flagella can be attributed to intrinsic properties of their protein, flagellin, which self assembles into helices.


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