highly significantP < 0.001
In all cases, differences are significant for P < 0.05, very significant for P < 0.01, highly significant for P < 0.001, and extremely significant for P < 0.0001.
In all cases, differences are significant for P < 0.05, very significant for P < 0.01, highly significant for P < 0.001, and extremely significant for P < 0.0001.
In contrast, Suv4-20h1 −/− MEFs showed a slightly decreased frequency of T-SCE events than wild-type cells, although this difference did not reach statistical significance (χ 2 test; P = 0.3271; Fig. 6 A ).