Homology-directed repair is required for the development of radioresistance during S phase: interplay between double-strand break repair and checkpoint response.
Tamulevicius P, Wang M, Iliakis G. Homology-directed repair is required for the development of radioresistance during S phase: interplay between double-strand break repair and checkpoint response. Radiat Res. 2007 Jan; 167(1):1-11.