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(A and B) Phase-field representations of a metachronal wave, for an array of 60 × 60 cilia, at two times separated by about 40 beats. The color denotes the projected displacement of the tip of a cilium from its base in the direction of the power stroke. (C) Time dependence of a selected line of cilia along the x axis. As a function of time, defects in the metachronal wave pattern appear and disappear.
