Fig. 6From: Enhanced Biocompatibility in Anodic TaO x Nanotube ArraysFluorescence microscopy images of the fibroblast cell attachment on the a Ta foil and self-organized TaO x nanotubes with diameters of b 20, c 35, d 65, and e 90 nm, respectively. The red fluorescence indicates cytoskeletal protein actin filament, and the blue fluorescence indicates nucleiBack to article page