Figure 4: Cysteine-regulated gene expression. CAT catalase; COX: cyclooxygenase; GPX: glutathione peroxidase; IKK: Iκ kinases; iNOS: inducible nitric oxide synthase; Keap1: Kelch-like ECH-associating protein 1; Nfr2: nuclear factor-erythroid 2-related factor 2; NF-kB: nuclear factor kappa-light-chain-enhancer of activated B cells; ROS: reactive oxygen species; SH: thiol; SOD: superoxide dismutase.