A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of tumor necrosis factor receptor superfamily member 14 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054219 (CD40/TNFRSF14 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 tumor necrosis factor receptor superfamily member 14 (human) in blood.