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Flagellar synchronization in multicellular vs. unicellular algae. (A) Pairs of isolated, somatic flagella of VC tend to synchronize either in IP or AP depending on their relative orientation. (B) CR flagella maintain position 2 yet swim a robust IP breaststroke that is lost (i) by mutation of the DF, and (ii) in pairs of nearby uniflagellate cells. (C and D) Ultrastructure comprising BBs, rootlets, and eyespot in VC (C) and CR (D). Numbered microtubule triplets are denoted by t1−t9.
