The present invention relates to {HEAD ~ the field} of {TAIL ~ molecular biology}, in particular the invention provides materials and methods for the production of homogeneous compositions of PEGylated erythropoietin with desired N glycoforms 
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The present invention relates to { HEAD ~ the field } of { TAIL ~ molecular biology } , in particular the invention provides materials and methods for the production of homogeneous compositions of PEGylated erythropoietin with desired N glycoforms
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