A compound attribute that is the ratio of amount of platelet glycoprotein Ib alpha chain (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood. The trait is OBA_2053414 (GP1BA/HBEGF protein level ratio in blood). Also known as: the ratio of amount of platelet glycoprotein Ib alpha chain (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood.