Fig. 4From: Establishment of perpendicular protrusion of type I collagen on TiO2 nanotube surface as a priming site of peri-implant connective fibersSEM images of CoI attached on the titanium surface. a TiO2–CoIEPF, b TNT–CoIEPF, c TiO2–CoICL, and d TNT–CoICL, a, b original magnification ×500,000. c, d original magnification ×100,000Back to article page