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. 2019 May 13;9:7263. doi: 10.1038/s41598-019-43784-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Real-time measurements of ciliary beating frequency in the RTECE. (a) Raw image, (b) the same image after high-pass filtering, with insets showing time variations in the location of a single cilium, and (c) Temporal spectra of intensities in each pixel based on analysis of 512 images acquired at 160 frames per second. The gaussian fit is used for determining the mean CBF.