
Keywords: rhEPO, recombinant human erythropoietin; DPO, darbepoetin; IMERs, immobilised enzyme reactors; EPO, erythropoietin; PTM, posttranslational modification; PNGase F, peptide-N-glycosidase F; Asn, asparagine; TIS, turbo-ion spray; XIC, extracted ion chromatog