Ontology of Biological Attributes id OBA_2054030 (PLA2G4A/SDC4 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of cytosolic phospholipase A2 (human) in blood to amount of syndecan-4 (human) in blood. Also known as: the ratio of amount of cytosolic phospholipase A2 (human) in blood to amount of syndecan-4 (human) in blood.