Ontology of Biological Attributes term OBA_2054820 (CA4/TGFBR2 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 4 (human) in blood to amount of TGF-beta receptor type-2 (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 4 (human) in blood to amount of TGF-beta receptor type-2 (human) in blood.