A compound attribute that is the ratio of amount of protein disulfide-isomerase (human) in blood to amount of protein phosphatase 1 regulatory subunit 12A (human) in blood. The trait is P4HB/PPP1R12A protein level ratio in blood (OBA_2055149, an Ontology of Biological Attributes id). Also known as: the ratio of amount of protein disulfide-isomerase (human) in blood to amount of protein phosphatase 1 regulatory subunit 12A (human) in blood.