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