A compound attribute that is the ratio of amount of platelet endothelial aggregation receptor 1 (human) in blood to amount of scavenger receptor class F member 1 (human) in blood. The trait is OBA_2053998 (PEAR1/SCARF1 protein level ratio in blood). Also known as: the ratio of amount of platelet endothelial aggregation receptor 1 (human) in blood to amount of scavenger receptor class F member 1 (human) in blood.