A compound attribute that is the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of tyrosine-protein phosphatase non-receptor type 6 (human) in blood. The trait is GRAP2/PTPN6 protein level ratio in blood (OBA_2053444, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of tyrosine-protein phosphatase non-receptor type 6 (human) in blood.