Fig. 8From: Establishment of perpendicular protrusion of type I collagen on TiO2 nanotube surface as a priming site of peri-implant connective fibersSEM images of epithelial cells attached on the surface of each group in cell attachment assay. a1, 2 TiO2, b1, 2 TNT, c1, 2 TiO2–CoICL, d1, 2 TNT–CoICL, e1, 2 TNT–CoIEPF. a1–e1: original magnification ×300. a2–e2: Original magnification ×1500Back to article page