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SEM photomicrographs of blank PEtOx NPs and CIP-loaded PEtOx NPs (A) blank PEtOx NPs before freeze-drying; 10 μm (B) 5 mg CIP-loaded NPs before freeze-drying; 500 nm (C) 10 mg CIP-loaded NPs before freeze-drying; 500 nm (D) 15 mg CIP-loaded NPs after freeze-drying; 10 μm (E) 20 mg CIP-loaded NPs after freeze-drying; 500 nm (F) 25 mg CIP-loaded NPs after freeze-drying; 500 nm.
