A compound attribute that is the ratio of amount of endoglin (human) in blood to amount of platelet endothelial aggregation receptor 1 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054668 (ENG/PEAR1 protein level ratio in blood). Also known as: the ratio of amount of endoglin (human) in blood to amount of platelet endothelial aggregation receptor 1 (human) in blood.