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20 mM Tris-HCl, pH 8.0, with 600 mM NaCl, 2 mM CaCl2 , and 20% sucrose

>=95% by SDS-PAGE

MW 420,000

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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