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20 mM Tris, pH 8.3, with 1.5 M NaCl

>=95% by SDS-PAGE

MW 27,100

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

> 1 year 

Lyophilized at <= -20° C

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