A compound attribute that is the ratio of amount of ATPase inhibitor, mitochondrial (human) in blood to amount of tumor necrosis factor receptor superfamily member 5 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054117 (ATP5IF1/CD40 protein level ratio in blood). Also known as: the ratio of amount of ATPase inhibitor, mitochondrial (human) in blood to amount of tumor necrosis factor receptor superfamily member 5 (human) in blood.