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The covalent conjugation of poly(ethylene glycol) (PEG) to therapeutic proteins exemplifies clinically relevant polymer therapeutics. Such PEGylated proteins exhibit improved therapeutic efficacy over the native proteins, with prolonged in vivo circulation time resulting from enhanced protein stability in the bloodstream and increased size and an associated reduction in immunogenicity.A major therapeutic benefit resulting from these characteristics is a decreased dosing frequency required for effective therapy, enabled by the effect of PEGylation on in vivo pharmacokinetics of the proteins.
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