Abstract
beta-Factor XIIa (beta-XIIa, Mr approximately 30,000) was isolated from human plasma by a procedure which utilized, as an initial step, the adsorption of Factor XII to celite. Activation of Factor XII and subsequent release of beta-XIIa was brought about by the proteolytic action of co-adsorbed kallikrein. Two successive chromatographic procedures were then used to achieve a final purification of 4,420-fold over plasma and an overall field of 2.3 mg of beta-XIIa per liter.
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