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SEM images of MG-63 cell on samples after culturing for 4 hours: (A, a) Ti substrate, (B, b) air-TNTs, and (C, c) H2-TNTs.
Note: Figures a–c show figures A–C at high magnification, respectively.
Abbreviations: SEM, scanning electron microscopy; Ti, titanium; air-TNTs, air-annealed TiO2 nanotubes; H2-TNTs, hydrogenated TiO2 nanotubes.
