the enzyme purified was catalytically inactive and activated by anaerobic incubation with either l-cysteine or its analogues such as carboxymethyl-l-cysteine , carboxyethyl-l-cysteine , s-methyl-l-cysteine , d-cysteine , cysteamine , n-acetyl-l-cysteine , and dl-homocysteine .
C0010654
cysteine
C0001047
n-acetyl-l-cysteine