through the use of a cysteine-requiring mutant ofescherichia coli k-12 that could also grow in the presence of glutathione , we were able to study the effect of selenite , selenide , andl-selenocysteine , each at a concentration of 0.1 mum , on the synthesis of formate dehydrogenase .
C0010654
cysteine
C0074289
selenocysteine