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