Hwang et al. investigated the antiinflammatory effects of an ACN fraction from purple sweet potato (AF) in dimethylnitrosamine-induced and tert-butyl hydroperoxide-induced liver injury separately and found that AF decreased cyclooxygenase-2 and inducible NO synthase (iNOS) expression by inactivating NF-κB. This evidence concerns the gene NFKB1 and atrial fibrillation.