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. 2015 Oct 19;5:226. doi: 10.3389/fonc.2015.00226

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Copyright © 2015 George, Hada and Cucinotta.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Dose–response curves for chromosome exchanges induced by 2500 MeV protons (A) and 2000 MeV/μ protons (B). The 2000-MeV exposures were shielded with a combination of 50 g/cm² aluminum and 10 cm polyethylene. The 2500-MeV exposure were shielded with 50 g/cm² aluminum only. Error bars indicate SEMs and background values have been subtracted for all data points. Curve fit is extrapolated to the axis.