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Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Baseline TC motility (n = 200). (a) Mean TC velocity. (b) Most TCs transit in less than 24 h. (c) Mean (±s.e.m.) of TC displacement showed a linear relationship to the square root of time, indicating random walk behaviour.