A compound attribute that is the ratio of amount of platelet glycoprotein VI (human) in blood to amount of hippocalcin-like protein 1 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2053421 (GP6/HPCAL1 protein level ratio in blood). Also known as: the ratio of amount of platelet glycoprotein VI (human) in blood to amount of hippocalcin-like protein 1 (human) in blood.