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protein precipitation without phenol/chloroform for dna extraction? - (Jul/16/2009 )

we've been using 4M guanidine thiocyanate to lyse cells (whole blood) for dna extraction. what is the best way to precipitate proteins from this lysis solution without using phenol/chloroform?

thanks in advance!


Salt 'em out: add 10 M Na Acetate to final concentration of 2 M.