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20 mM potassium phosphate, pH 7.0, with 250 mM KCl 

>=95% by SDS-PAGE 

MW 100,000

Human Plasma

Shown to be non reactive for HBsAg, anti-HCV, anti-HBc, and negative for anti-HIV 1 & 2 by FDA approved tests. 

> 1 year

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