A compound attribute that is the ratio of amount of proteinase-activated receptor 1 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is F2R/PDGFB protein level ratio in blood (OBA_2055330). Also known as: the ratio of amount of proteinase-activated receptor 1 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.