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Pegylated erythropoietin is an erythropoietin receptor activator with greater activity in vivo as well as increased half-life, in contrast to erythropoietin. It differs from erythropoietin through the integration of an amide bond between the N-terminal amino group or the ε-amino group of any lysine present in erythropoietin, predominantly Lys52 and Lys45 and Pegylated Erythropoietin (PEG).