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Chemical structure of poly(lactide-co-glycolide). Indices x and y refer to the relative amounts of lactide and glycolide units, respectively, in a specific PLG copolymer. These indices are incorporated in PLG nomenclature; e.g. an x = 85% lactide, y = 15% glycolide is indicated as 85:15 PLG. x and y can be manipulated to alter the degradation rate of the PLG. An increase in x results in a slower degradation rate
