A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 11B (human) in blood to amount of tumor necrosis factor ligand superfamily member 11 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2053059 (TNFRSF11B/TNFSF11 protein level ratio in blood). Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member 11B (human) in blood to amount of tumor necrosis factor ligand superfamily member 11 (human) in blood.