A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 8 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood. The trait is TNFRSF8/TNFRSF9 protein level ratio in blood (OBA_2052994). Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member 8 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood.