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Structure of PAMAM and PAMAM-Es was similar under transmission electron microscopy (37000x, BAR = 200 nm). (a) Morphology of PAMAM under TEM. (b) Morphology of PAMAM-Es under transmission electron microscopy. Open arrows: PAMAM monomer (diameter: 5–10 nm); close arrows: PAMAM polymerize compound (diameter: 50–200 nm).
