A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of mitochondrial fission 1 protein (human) in blood. The trait is CD40/FIS1 protein level ratio in blood (OBA_2054202). Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of mitochondrial fission 1 protein (human) in blood.