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20 mM sodium phosphate, pH 7.4, 150 mM NaCI and 0.05% NaN3

>=95% by SDS-PAGE

MW 50,000

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

> 1 year 

<= -20° C

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