A compound attribute that is the ratio of amount of platelet endothelial aggregation receptor 1 (human) in blood to amount of Kunitz-type protease inhibitor 2 (human) in blood. The trait is PEAR1/SPINT2 protein level ratio in blood (OBA_2054000). Also known as: the ratio of amount of platelet endothelial aggregation receptor 1 (human) in blood to amount of Kunitz-type protease inhibitor 2 (human) in blood.