text: Most halogenated cysteine S-conjugates are metabolized by cysteine S-conjugate << beta-lyases >> to [[ pyruvate ]], ammonia, and an alpha-chloroenethiolate (with DCVC) or an alpha-difluoroalkylthiolate (with TFEC) that may eliminate halide to give a thioacyl halide, which reacts with epsilon-amino groups of lysine residues in proteins.