Ontology of Biological Attributes id OBA_2054720 (EPHA1/LTBR protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of ephrin type-A receptor 1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 3 (human) in blood. Also known as: the ratio of amount of ephrin type-A receptor 1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 3 (human) in blood.