Figure 7 (A) Effect of opuntiol and/or UVA-induced DNA single-strand breaks analyzed by single-cell gel electrophoresis. Photomicrographs showed DNA damage evidenced by the increased tail formation in UVA-exposed NIH-3T3 cells (original magnification, 20X). (B) Percent Tail DNA and Comet attributes were analyzed using CASP software. Values are given as means ± S.D. of six experiments in each group. Values not sharing a common marking (a,b,c) differ significantly at p ≤ 0.05 (DMRT).