EFNA4/TNFRSF10B protein level ratio in blood (OBA_2055599) can be described as follows. A compound attribute that is the ratio of amount of ephrin-A4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 10B (human) in blood. Also known as: the ratio of amount of ephrin-A4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 10B (human) in blood.