A compound attribute that is the ratio of amount of Crk-like protein (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood. The trait is CRKL/IRAK4 protein level ratio in blood (OBA_2054500). Also known as: the ratio of amount of Crk-like protein (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood.