“…SuZJlzydryZ. Two 10 ml aliquots of each of the hydrolysates were analyzed each in quadruplicate, for total sulfhydryl content according to the iodometric titration procedure of Okuda (22,23). In this procedure, cystine is reduced and is measured as cysteine along with other compounds containing a free sulfhydryl group such as mercaptans and glutathione.…”