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20 mM Tris, pH 8.0, with 280 mM NaCl, 5 mM CaCl2, and 0.05% NaN3

>=95% by SDS-PAGE

24,000 Da (reduced) 

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

>5 years

<= -70° C

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