CXCL9/TNFRSF9 protein level ratio in blood (OBA_2055111, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of C-X-C motif chemokine 9 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood. Also known as: the ratio of amount of C-X-C motif chemokine 9 (human) in blood to amount of tumor necrosis factor receptor superfamily member 9 (human) in blood.