Ontology of Biological Attributes id OBA_2055719 (CA13/HSPB1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of heat shock protein beta-1 (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of heat shock protein beta-1 (human) in blood.