BTN2A1/IL18BP protein level ratio in blood (OBA_2053169, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of butyrophilin subfamily 2 member A1 (human) in blood to amount of interleukin-18-binding protein (human) in blood. Also known as: the ratio of amount of butyrophilin subfamily 2 member A1 (human) in blood to amount of interleukin-18-binding protein (human) in blood.