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Proteolytic activity of native cysteine proteases was studied in bovine milk. Five fractions (fI-fV) with cysteine protease activity were separated from acid whey prepared from raw bovine milk by ion-exchange chromatography on Q-Sepharose. The hydrolytic action of the most active fractions (fIII and fV), after further purification using gel permeation chromatography on Superdex S75, was studied against...