Ontology of Biological Attributes entry OBA_2053002 (HBEGF/PDGFA protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of proheparin-binding EGF-like growth factor (human) in blood to amount of platelet-derived growth factor subunit A (human) in blood. Also known as: the ratio of amount of proheparin-binding EGF-like growth factor (human) in blood to amount of platelet-derived growth factor subunit A (human) in blood.