A compound attribute that is the ratio of amount of hypoxia up-regulated protein 1 (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood. The trait is HYOU1/RARRES2 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2052973). Also known as: the ratio of amount of hypoxia up-regulated protein 1 (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood.