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(a) Synthetic route of four-arm PEG-PPS: (I) PEG-allyl, (II) PEG-thioacetate, (III) PEG-PPS, and (IV) PEG-PPS-RGD synthesis. (b) TEM image of (PEG113-PPS5)4 self-assembled micelles at concentration of 0.1% in water at 100,000X magnification.
