Effects of OM-LV20 on cell viability and CAT level following H2O2stimulation.A, OM-LV20 exhibited a protective activity against H2O2 stimulation in CTX-TNA2 cells. n = 3. B, OM-LV20 improved abnormal decrease in CAT induced by H2O2 stimulation in CTX-TNA2 cells. Data are means ± SEM. n = 4, ∗∗ p < 0.01, ∗∗∗∗ p < 0.0001. Control group data were normalized to 100% and other data were normalized accordingly. CAT, catalase.