CA13/TIA1 protein level ratio in blood (OBA_2055725, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of cytotoxic granule associated RNA binding protein TIA1 (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of cytotoxic granule associated RNA binding protein TIA1 (human) in blood.