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Proteasome-inhibitory effects of curcumin and its analogs on colon cancer cells. Human colon cancer cell lines HCT116 (A) and SW480 (B) were treated with the indicated concentrations of curcumin (CUR), curcumin monoacetate (AC-CUR) or curcumin diacetate (AC2-CUR) for 36 h, followed by the proteasomal chymotrypsin (CT)-like activity assay.
