Product Description: The product contains the polyhedrin protein co-crystalized with Human RANK Ligand. Receptor activator of nuclear factor kappa-B Ligand (RANK Ligand) is a cell-bound marker related to the Tumor Necrosis Factor (TNF) family of proteins. RANK Ligand plays a critical role in bone metabolism and osteoclast differentiation. T cell expression of RANK Ligand promotes dendritic cell maturation.