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. 2014 Jun 12;9(6):e99840. doi: 10.1371/journal.pone.0099840

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© 2014 Li et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A: Three representative waveforms of spontaneous ciliary motion measured from ciliated cells near the pharyngeal opening using a photodiode-based displacement measurement system. The responses were obtained from three different cells at P1. B: The power spectra of ciliary motion of the waveforms shown in Panel A. C: Means and SD of beat frequencies during different stages of development. The means are based on measurements made from 12 cells from three animals for each age group.