The immunosuppressive action of N,N, S-trimethyl-cysteine, S-methyl-L-cysteine hydrazide hydrochloride and L-cysteine hydrazide on the course of post-adjuvant polyarthritis, graft-versus-host reaction, turpentine oedema and incorporation of 3H-thymidine into spontaneous or PHA stimulated lymphocyte
Phenylalanine 4-monooxygenase is the key enzyme in the sulfoxidation of the thioether drug S-carboxymethyl-l-cysteine and its thioether metabolites, S-methyl-l-cysteine, N-acetyl-S-carboxymethyl-l-cysteine and N-acetyl-S-methyl-l-cysteine in humans, and a number of other mammalian species. The