Abstract
Summary.: The aminopolypeptidase from the cattle diaphragm muscle has been obtained in a state of high purity. The enzyme is a carbohydrate‐frec protein with an isolelectric point close to pH 4.6.The writer is indebted to the Johan and Therese Andersson. Minne foundation for grants which supported the present investigation. He further acknowledges the valuable assistance of Mrs Agren throughout the investigation.

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