CRELD2/ERP44 protein level ratio in blood (OBA_2054560, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of protein disulfide isomerase CRELD2 (human) in blood to amount of endoplasmic reticulum resident protein 44 (human) in blood. Also known as: the ratio of amount of protein disulfide isomerase CRELD2 (human) in blood to amount of endoplasmic reticulum resident protein 44 (human) in blood.