A compound attribute that is the ratio of amount of tyrosine-protein kinase receptor UFO (human) in blood to amount of interleukin-18-binding protein (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053538 (AXL/IL18BP protein level ratio in blood). Also known as: the ratio of amount of tyrosine-protein kinase receptor UFO (human) in blood to amount of interleukin-18-binding protein (human) in blood.