A compound attribute that is the ratio of amount of butyrophilin subfamily 2 member A1 (human) in blood to amount of interferon gamma receptor 1 (human) in blood. The trait is BTN2A1/IFNGR1 protein level ratio in blood (OBA_2053167, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of butyrophilin subfamily 2 member A1 (human) in blood to amount of interferon gamma receptor 1 (human) in blood.