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Cytotoxic profiles of bioactive compounds from coffee beans in HT-29 human colorectal cells. HT-29 cells were incubated with caffeic acid, caffeine, chlorogenic acid, or kahweol for 24 h and cell viability was examined using MTT assay. Results are expressed as the mean ± SD of three or more independent experiments. *p<0.05, **p<0.01, and ***p<0.001 vs. control.
