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20 mM NaH2PO4 , pH 7.4, with 150 mM NaCl 

>=95% by SDS-PAGE 

MW 385,000

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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