Ontology of Biological Attributes identifier OBA_2055182 (APP/DKK1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of dickkopf-related protein 1 (human) in blood. Also known as: the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of dickkopf-related protein 1 (human) in blood.