A compound attribute that is the ratio of amount of GDNF family receptor alpha-3 (human) in blood to amount of layilin (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2053701 (GFRA3/LAYN protein level ratio in blood). Also known as: the ratio of amount of GDNF family receptor alpha-3 (human) in blood to amount of layilin (human) in blood.