Ontology of Biological Attributes identifier OBA_2053854 (CPA1/CPB1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of carboxypeptidase A1 (human) in blood to amount of carboxypeptidase B (human) in blood. Also known as: the ratio of amount of carboxypeptidase A1 (human) in blood to amount of carboxypeptidase B (human) in blood.