CDKN2D/FOXO1 protein level ratio in blood (OBA_2055457) can be described as follows. A compound attribute that is the ratio of amount of cyclin-dependent kinase 4 inhibitor D (human) in blood to amount of forkhead box protein O1 (human) in blood. Also known as: the ratio of amount of cyclin-dependent kinase 4 inhibitor D (human) in blood to amount of forkhead box protein O1 (human) in blood.