A compound attribute that is the ratio of amount of ephrin-A4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 10A (human) in blood. The trait is OBA_2055598 (EFNA4/TNFRSF10A protein level ratio in blood). Also known as: the ratio of amount of ephrin-A4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 10A (human) in blood.