A compound attribute that is the ratio of amount of hypoxia up-regulated protein 1 (human) in blood to amount of transforming growth factor beta receptor type 3 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2052975 (HYOU1/TGFBR3 protein level ratio in blood). Also known as: the ratio of amount of hypoxia up-regulated protein 1 (human) in blood to amount of transforming growth factor beta receptor type 3 (human) in blood.