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Scanning electron microscopy (SEM) images of TgP2-pVAX1 plasmids entrapped in poly-lactic-co-glycolic acid (PLGA) (A) and chitosan nanospheres (B). By double emulsion solvent evaporation (w/o/w) and ionic gelation technique, PLGA and chitosan nanospheres were synthesized. After being completely freeze-dried, nanospheres were imagined at a magnification of ×30,000 (bar represents 500 nm).
