FOXO1/IRAK4 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054143) can be described as follows. A compound attribute that is the ratio of amount of forkhead box protein O1 (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood. Also known as: the ratio of amount of forkhead box protein O1 (human) in blood to amount of interleukin-1 receptor-associated kinase 4 (human) in blood.