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CD spectra of free bovine serum albumin (BSA) (1) and triptolide–BSA complex (2,3): The concentration of BSA was 1.5×10−6 mol•L−1. The concentrations of triptolide from 1 to 3 were 0.00, 1.5×10−6, 6×10−6 mol-L 1, respectively. CD, circular dichroism.
