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Comparison between crawling on agarose and crawling in artificial soil. A. Agarose. B & C Artificial soil device. Elapsed time (sec) is indicated on the lower left of each frame. Behavioral state (F, forward crawling; R, reverse crawling; Ω, omega-turn) is indicated on the lower right. Post diameter is 100 μm; the minimum gap between posts is 100 μm. Panels B and C were taken from Supplemental Movies 1 and 2, respectively.
