A protein-tyrosine kinase has been isolated from a soluble extract of bovine thymus based on its ability to phosphorylate the tyrosine-containing peptide angiotensin I. The purification procedure employs sequential chromatography on columns of DEAE-cellulose, heparin-agarose, casein-agarose, butyl-agarose, and Sephadex G-75. The purified enzyme (p40) is a… (More)
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