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Chlamydomonas and the structure of the eukaryotic axoneme. (a) The two flagella are termed cis and trans based on their position relative to the eyespot (orange). (b) The axoneme consists a 9+2 arrangement of microtubule doublets on which dynein motors initiate interdoublet sliding and produce the flagellar beat. Figure adapted from Wan et al. (2014).
