A compound attribute that is the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is OBA_2053918 (APP/PDGFB protein level ratio in blood). Also known as: the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.