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Flagellar rootlets play an important role in “primitive motile systems.” They are made of filaments able to contract by twisting and Ca+2 binding. The pusules of Dinoflagellates appear to be under the control of large bundles of 2.4 nm nonactin filaments that correspond to the striated rootlets of their two flagella.
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Cachon et al. (1983) studied this question.
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