- Not to be confused with Osteopontin (OPN).
Osteoprotegerin (OPG), also known as
osteoclastogenesis inhibitory factor (OCIF), or
tumor necrosis factor receptor superfamily member 11B (TNFRSF11B), is a
protein that in humans is encoded by the
TNFRSF11B gene. Osteoprotegerin is a
cytokine receptor, and a member of the
tumor necrosis factor (TNF) receptor superfamily.