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. 2017 May 3;33(4):373–388. doi: 10.1007/s10565-017-9394-9

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© The Author(s) 2017

Open Access This 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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The kinetics of ionizing radiation-induced foci (IRIF) in serum-shocked γ-irradiated human CCD-34Lu fibroblasts. The mean number of γ-H2AX foci and 53BP1 foci (a) after irradiation administered at the trough and the peak of PER2 protein expression. b Representative immunofluorescence of γ-H2AX and 53BP1 foci in nuclei stained with DAPI at 0.5, 2, 6, and 24 h after irradiation. c Cells were categorized as having 0–4, 5–9, 10–15, and >15 of γ-H2AX and 53BP1 foci/nucleus. Data are means ± SD from independent experiments, each with at least 200 nuclei/time points, carried out in cells irradiated at the trough and the peak of PER2 protein expression (^• p < 0.1, *p < 0.05; ANOVA test)