A compound attribute that is the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood. The trait is GRAP2/IRAK4 protein level ratio in blood (OBA_2053437). Also known as: the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood.