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Concentration dependent percentage survival by MTT assay of Aβ42 fibrils (48 hrs) induced neurotoxicity on PC12 cells; RS—R.serpentina extract (100, 50, 25 μg/mL); AJM—Ajmalicine (40, 20, 10 μM); RES—Reserpine (40, 20, 10 μM); NC—PC12 cells treated with Aβ42 only (40 μM); PC—Homotaurine (40 μM), data represented as mean ± SEM, n = 3; and difference in mean is statistically significant (*) p < 0.05 and very significant (**) p < 0.01 as compared to control group.
