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. 2016 Jun 23;18:150. doi: 10.1186/s13075-016-1047-5

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Place escape/avoidance paradigm operant test repeatability (least squares mean ± standard error of the mean). A group of five animals underwent the place escape/avoidance parading operant test (percentage of the time spent on the dark side) over a 20-minute (period 1 = 0–5 minutes, period 2 = 5–10 minutes, period 3 = 10–15 minutes, and period 4 = 15–20 minutes) daily from days 1 to 15, and then on days 18 and 25. ^a,b,c Significant inter-period differences (adjusted P value ≤0.0216)