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Poly(lactic-co-glycolic acid)-b-Poly(ethylene glycol)-b-Poly(lactic-co-glycolic acid) 1600:1000:1600 24%PEG 1500:1000:1500 25%PEG 2000:400:2000 9%PEG 400:400:400 33%PEG 5000:1000:5000 9%PEG 70000:4600:70000 3%PEG 70000:8000:70000 5%PEG 70000:10000:70000 7%PEG 1500:1500:1500 33%PEG 70000:2000:70000 1%PEG 2000:1000:2000 25%PEG 6000:10000:6000,7:3LA:GA 45%PEG 3750:6000:3750,70:30LA:GA 44%PEG