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. 2021 Aug 5;8:207. doi: 10.1038/s41597-021-00985-w

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© The Author(s) 2021

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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Fig. 2 — Schematic of the impactor device. (a) Side view of the body and head support of the device with the piston at the highest (impact) position, (b) Top view the body and head support of the device with the piston at the highest (impact) position and the nose cone (orange c) removed for clarity, (c) frame-by-frame breakdown of high-speed camera footage of mouse cadaver’s head impacted at piston velocity = 5.2 m/s from just before the start of the impact and the furthest head position. (Orange letters) a = piston and brass impactor tipped with neoprene rubber, b = head support plate, c = isoflurane anaesthesia nose cone, (d) = non-slip silicone body support, (e) = masking tape restraints, (f) = tail restraint, g = “crosshairs” to “aim” the impactor at head position marker (i), h = Velcro body restraint straps, i = 1 mm thick masking tape indicating position to be centred around (g) crosshair. Figures and legends previously included in¹⁵.