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