partially purified tryptophan-5-monooxygenase ( l-tryptophan , tetrahydropteridine : oxygen oxidoreductase ( 5-hydroxylating ) ec 1.14.16.4 ) from bovine pineal gland was activated by preincubation with sulfhydryl agents such as dithiothreitol , l-cysteine , cysteamine , l-cysteine ethylester , n-acetyl-l-cysteine , 2-mercaptoethanol and reduced glutathione , at alkaline ph ( optimum ph equals 8.5 ) .
C0010654
l-cysteine
C0001047
n-acetyl-l-cysteine