Magnification X 100 Immunohistochemistry analysis of collagen type I, OPG and RANKL (−; no immunoreactivity, +; weak immunoactivity, ++; moderate immunoactivity, +++; strong immunoactivity, Abbreviations: OPG osteoprotegerin, RANKL receptor activator nuclear factor κB ligand) In the analysis of OPG expression, it shows moderate expression at 2, 4 weeks, and decrease at 8 weeks.
Source: wiktionary