Ontology of Biological Attributes id OBA_2053171 (BTN2A1/PIK3IP1 protein level ratio in blood) 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 phosphoinositide-3-kinase-interacting protein 1 (human) in blood. Also known as: the ratio of amount of butyrophilin subfamily 2 member A1 (human) in blood to amount of phosphoinositide-3-kinase-interacting protein 1 (human) in blood.