A compound attribute that is the ratio of amount of carboxypeptidase B (human) in blood to amount of kin of IRRE-like protein 2 (human) in blood. The trait is CPB1/KIRREL2 protein level ratio in blood (OBA_2054589, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of carboxypeptidase B (human) in blood to amount of kin of IRRE-like protein 2 (human) in blood.