FIG. 1.

UDG-BER activities for nuclear extracts prepared from enriched populations of spermatogenic cell types obtained from CD1 mice. Results are presented as mean ± standard error of the mean (SEM) of three replicate assays for each of three independent nuclear extract preparations. Cell types exhibiting similar UDG-BER activity are indicated by having the same letter. Prim A, primitive type A spermatogonia; Type A, type A spermatogonia; Type B, type B spermatogonia; Pach., pachytene spermatocytes; R-Tids, round spermatids.