| http://www.w3.org/ns/prov#value | - Preferably, the solution is an aqueous solution with a distilled, deionized water (dH2O) base consisting of trishydroxymethylaminomethane (TRIS??? base) at a concentration of about 25-500 mM, preferably about 50-250 mM, more preferably about 50-150 mM, and most preferably about 100 mM, at a pH of about 7.0-9.0, preferably about 7.5-9.0, more preferably about 8.0-8.5, and most preferably about 8.5
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