Ontology of Biological Attributes id OBA_2055454 (CDKN2D/CNPY4 protein level ratio in blood) 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 protein canopy homolog 4 (human) in blood. Also known as: the ratio of amount of cyclin-dependent kinase 4 inhibitor D (human) in blood to amount of protein canopy homolog 4 (human) in blood.