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(a) Cell and flagellar boundaries in successive frames are superposed. (Inset) The polarly unwrapped flagella envelope exhibits micron fluctuations (see error bars; shading is one std), while (b) individual flagella display robust oscillations. (c) Cell centroid fluctuations are subpixel and random, yet flagella tips oscillate. All eight flagella bifurcate simultaneously to full-amplitude beating (shock).
