Figure 3 (A). Effect of opuntiol and/or UVA radiation on intracellular ROS generation analyzed by DCFH-DA staining. Photomicrograph shows the green fluorescence under a green lamp (original magnification, 20X). (B) Bar diagram representing percent of fluorescence intensity analyzed using a multimode reader (Teccan, Austria). Values are given as means ± S.D. of six experiments in each group. Values not sharing a common marking (a, b, c, d) differ significantly at p ≤ 0.05 (DMRT).