Ontology of Biological Attributes id OBA_2053699 (GFRA1/TNFRSF1A protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of GDNF family receptor alpha-1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood. Also known as: the ratio of amount of GDNF family receptor alpha-1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 1A (human) in blood.