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An acrosin inhibitor was isolated from bull seminal plasma by gel filtration on Sephadex G-50 fine and ion-exchange chromatography on CM-Sephadex. The inhibitor is a basic polypeptide (pl greater than or equal to 10.5) of molecular weight 6 200 (calculated from amino acid composition). Its N-terminal amino group is blocked. The inhibitor is not strictly specific in its effect since it also inhibits trypsin and to a lesser degree chymotrypsin, in addition to bull and boar acrosin.

Isolation of Basic Acrosin Inhibitor from Bull Seminal Plasma (BUSI II)