1. Renin was purified to homogeneity from bovine anterior pituitary by using batchwise DEAE-cellulose chromatography, pepstatin-aminohexyl-agarose affinity chromatography, Ultrogel AcA 44 gel filtration and DEAE-Sephacel and CM-cellulose ion exchange chromatography.

2. The enzyme has a molecular weight of 36 000 and an isoelectric point of 5.25, and exhibits optimum activity at a pH between 6.5 and 7.5.

3. The amino acid composition and antigenic properties of this purified renin are very similar to those of rat, dog and hog kidney renins.

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