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Effect of various concentrations of β-stigmasterol (with ergosterol) (L1 a & b) and xylopic acid (XL4) on normal rat liver caspase-3 (A, B) and −9 (C, D) activities (mean ± SEM, n = 5). Values with different alphabets are statistically different at P < 0.05. NTA: Non-triggering agent; TA: Triggering agent (Calcium).
