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Scanning electron microscopy images taken at different magnifications (1000×, 3000× and 25,000–35,000×) of (a–c) Prototype 1 placebo; (d–f) Prototype 1 tobramycin loaded; (g,h) Prototype 2 placebo; (i) Prototype 2 placebo with PBS crystals; (j–l) Placebo 2 tobramycin loaded.
