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