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By measurement of its arginine esterase activity, plasma kallikrein was purified from fresh frozen ACD plasma. The steps involved alcohol fractionation, isoelectric precipitation, and carboxymethyl (CM) Sephadex and DEAE cellulose chromatography. Three enzymatically active fractions were finally isolated and termed plasma kallikreins I, II, and III; they represented purifications of 970,320- and 590-fold, respectively.
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