A compound attribute that is the ratio of amount of forkhead box protein O1 (human) in blood to amount of ubiquitin carboxyl-terminal hydrolase 8 (human) in blood. The trait is FOXO1/USP8 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054180). Also known as: the ratio of amount of forkhead box protein O1 (human) in blood to amount of ubiquitin carboxyl-terminal hydrolase 8 (human) in blood.