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Gold-labeled antibodies inside (A, B) air-TNTs and (C, D) H2-TNT.
Note: The gold-labeled antibodies localized in the upper and middle sections of the air-TNTs (A, B), and penetrated deeper into the H2-TNTs (C, D).
Abbreviations: air-TNTs, air-annealed TiO2 nanotubes; H2-TNTs, hydrogenated TiO2 nanotubes.
