A compound attribute that is the ratio of amount of parkinson disease protein 7 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood. The trait is OBA_2055157 (PARK7/TNFRSF9 protein level ratio in blood). Also known as: the ratio of amount of parkinson disease protein 7 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood.