A compound attribute that is the ratio of amount of carboxypeptidase A1 (human) in blood to amount of chymotrypsin-C (human) in blood. The trait is CPA1/CTRC protein level ratio in blood (OBA_2053856, an Ontology of Biological Attributes id). Also known as: the ratio of amount of carboxypeptidase A1 (human) in blood to amount of chymotrypsin-C (human) in blood.