Thus, for example, most of the non protein constituents are removed by {TAIL ~ polyethyleneimine treatment} and the proteins including the polypeptides of the invention are precipitated, for example, by saturation of the solution with ammonium sulfate or with {HEAD ~ other salts} 
Thus , for example , most of the non protein constituents are removed by { TAIL ~ polyethyleneimine treatment } and the proteins including the polypeptides of the invention are precipitated , for example , by saturation of the solution with ammonium sulfate or with { HEAD ~ other salts }
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