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