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Figure 1. Chemical structures of several PEG-containing block copolymers used to prepare PEG-coated nanoparticles: monomethoxy poly (ethylene glycol)-poly(lactic acid) (PEG-PLA); monomethoxy poly (ethylene glycol)-poly(s caprolactone) (PEG-PCL); monomethoxy poly(ethylene glycol)-poly(sebacic acid) (PEG-PSA); N-PEG3PLA citric triamide (PEG3-PLA) and monomethoxy poly(ethylene glycol)-polycyanoacrylate (PEG-PACA).

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