A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of integrin beta-5 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054205 (CD40/ITGB5 protein level ratio in blood). Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of integrin beta-5 (human) in blood.