Analysis for the presence of micronuclei, nuclear bridges, and apoptotic nuclei was performed on fibroblast cells plated on coverslips, cultured for several days, fixed with 4% formaldehyde, and stained with DAPI. Indirect Immunofluorescence (IF) was performed on fibroblast cells, as previously described (Yehezkel et al., 2013 (link)) using mouse antiphosphorylated γ-H2AX (05–636; EMD Millipore). Scoring of γ-H2AX foci was done on a BX50 microscope (Olympus).