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. 2020 Jan 24;61(2):177–186. doi: 10.1093/jrr/rrz088

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© The Author(s) 2020. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1 — OE-21 and KYSE-450 cell survival after photon and proton irradiation. Clonogenic cell survival assays were performed in triplicate after irradiation with 2, 4, 6 or 8 Gy per fraction. Values correspond to the mean ± standard deviation. Data analysis was performed on pooled values from at least three independent experiments.