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There are a number of analytical procedures for the determination of cysteine in the presence of cystine, but all of them depend upon having the two substances as free compounds. It has not been possible to determine the separate amounts of cysteine and cystine groups in protein molecules because no means have been available for preventing interconversion of the two compounds during hydrolysis. A method for the separate determination of cystine and cysteine as they exist in proteins should bepmid:13163075 fatcat:2i2mq6ief5gbhjror62ka5e2zq