CNTN2/NELL2 protein level ratio in blood (OBA_2053862, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of contactin-2 (human) in blood to amount of protein kinase C-binding protein NELL2 (human) in blood. Also known as: the ratio of amount of contactin-2 (human) in blood to amount of protein kinase C-binding protein NELL2 (human) in blood.