Ontology of Biological Attributes entry OBA_2055422 (F9/RARRES2 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of coagulation factor IX (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood. Also known as: the ratio of amount of coagulation factor IX (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood.