Ontology of Biological Attributes identifier OBA_2053446 (GRAP2/SNX9 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of sorting nexin-9 (human) in blood. Also known as: the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of sorting nexin-9 (human) in blood.