. "Some alkyl thiols, cyanide, pyrazole and some other heterocyclic compounds can act as acceptors." . "Not identical with EC 2.5.1.51, EC 2.5.1.52 and EC 2.5.1.53." . . . "Cysteine synthase" . "O-acetylserine (thiol)-lyase" . "O-acetylserine sulfhydrylase" . "O-acetylserine (thiol)-lyase A" . "O-acetyl-L-serine sulfhydrylase" . "Acetylserine sulfhydrylase" . "Cysteine synthetase" . "O(3)-acetyl-L-serine acetate-lyase (adding hydrogen-sulfide)" . "O-acetyl-L-serine sulfohydrolase" . "OAS sulfhydrylase" . . "O(3)-acetyl-L-serine + H(2)S = L-cysteine + acetate." . "Pyridoxal 5'-phosphate" .