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. 2016 Jan 26;4:e1624. doi: 10.7717/peerj.1624

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© 2016 Wang et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) Sham irradiated HepG2 cells showing no γH2AX foci after 4 h culture and therefore no signs of DNA damage. (B) HepG2 cells γ-irradiated with 4 Gy showing γH2AX foci (yellow arrows) after 4 h culture and therefore DNA double-strand breaks.