Ontology of Biological Attributes identifier OBA_2054591 (CPB1/REG1A protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of carboxypeptidase B (human) in blood to amount of lithostathine-1-alpha (human) in blood. Also known as: the ratio of amount of carboxypeptidase B (human) in blood to amount of lithostathine-1-alpha (human) in blood.