Split dose irradiations with small initial dose.

<p>Number of γ-H2AX foci after exposure to 0.1 Gy at time 0 plus 1 Gy delivered 1 hr after (left column) and 4 hr later (right column). Top panels report the experimental data;bottom panels, data are fitted using the modelling <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079541#eqn4" target="_blank">equation (4)</a>. In the bottom panels, the solid line represents the modelling function for the split dose scenario. The dotted lines represent the modelling function for the individual radiation exposures. Error bars represent the standard error of the mean of 3 independent experiments.