Effects of paeonol on the expression of apoptosis pathway proteins in (A) SKOV3 and (B) OVCAR-3 cells. L1, control; L2, 50 µM paeonol only; L3, 100 µM paeonol only; L4, 2 Gy radiation only; L5, 4 Gy radiation only; L6, 6 Gy radiation only; L7, 50 µM paeonol + 2 Gy radiation; L8, 100 µM paeonol + 2 Gy radiation; L9, 50 µM paeonol + 4 Gy radiation; L10, 100 µM paeonol + 4 Gy radiation; L11, 50 µM paeonol + 6 Gy radiation; L12, 100 µM paeonol + 6 Gy radiation. Bcl-2, B-cell lymphoma-2; Bcl-xL, Bcl-extra large; Bad, Bcl-2-associated death promoter; Bax, Bcl-2-associated X.