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A, the differential interference contrast (DIC) image shows beating cilia located on the apical surface of the cell. Each cilium movement was detected in the video image. Scale bar, 4 μm. B, frame images taken every 30–40 ms. Panels B1–B12 show two beating cycles (panels 1–6 and panels 7–11). The ciliary beat frequency of this cell is approximately 5.4 Hz. Scale bar, 2 μm.
