Fibromodulin (FMOD) is a Class II small leucine-rich proteoglycan (SLRP) superfamily member. The ~50-70kD protein contains a sulfated N-terminal complement C1q binding domain (aa19-98) and 12 leucine-rich repeats (aa75-376). A 40kD form is reported in dental tissues. Fibromodulin participates in collagen fibrillogenesis in many tissues and competes with Lumican for collagen binding. It can participate in inflammation by activating complement. In epidermal keratinocytes, it may be located in the cytoplasm. The region of human FMOD used as an immunogen shares 96% aa identity with mouse or rat FMOD.