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