CD2AP/CD40 protein level ratio in blood (OBA_2055292, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of CD2-associated protein (human) in blood to amount of tumor necrosis factor receptor superfamily member 5 (human) in blood. Also known as: the ratio of amount of CD2-associated protein (human) in blood to amount of tumor necrosis factor receptor superfamily member 5 (human) in blood.