Abstract
The authors were unable to verify Wald-schmidt-Leitz and coworkers'' conclusion that the serums of subjects with carcinoma hydrolyze racemic di- and tripeptides beyond 50%. The serums of these subjects hydrolyze d-leucylglycylglycine, while those of normal subjects do not. This is shown by titration if the d-substrate is used, or by the use of d-amino acid oxidase with d,l-substrate.

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