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Scanning electron microscope images of (A) a drug-releasing implant based on a titanium (Ti) wire with titania nanotube (TNT) arrays on the surface (whole wire shown in inset), (B) the top surface of the TNTs, (C) a cross-sectional view showing hollow nanotube structures, and (D) the bottom surface, showing closed ends of the nanotube structures (the TNT layer was removed from the underlying Ti for imaging purposes).
