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. 2019 Jan 31;20(1):11. doi: 10.1186/s10194-019-0963-6

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© The Author(s). 2019

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.

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Fig. 1 — Representative pictures of spontaneous grimace induced in free-moving CD1 mice after peripheral CGRP. a Facial features observed at baseline, (b) facial features observed 30 min after peripheral administration of saline (PBS), (c and d) facial features observed 30 min after peripheral administration of CGRP (0.1 mg/kg, i.p)