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Fabrication of PLGA NGC. (a) Alginate rod was immersed in PLGA/Pluronic F-127 solution for 10 min. Tubular PLGA layer is formed due to phase separation when water diffuses out the alginate rod; coated alginate rod was thoroughly washed in water before alginate rod is removed (b) PLGA tube is cut into short segments to serve as NGC. (c) Cross section scanning electron microscopy picture of PLGA tube.
