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P. octopus cell (A) swims using multiple pairs of breaststrokes: highlighted are waveforms of one synchronous pair. In B, cell is at rest in a stand gait in which no flagellum is active. (C and D) Gradient images (Left) identify the active subset of flagella (all in C, or four of eight in D); optical flow fields (Right) show decay of beating-induced flow disturbance. (Scale bar: 10 μm.)
