CCN2/HBEGF protein level ratio in blood (OBA_2055226, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of CCN family member 2 (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood. Also known as: the ratio of amount of CCN family member 2 (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood.