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