Ontology of Biological Attributes entry OBA_2055442 (CDKN1A/FOXO1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of forkhead box protein O1 (human) in blood. Also known as: the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of forkhead box protein O1 (human) in blood.