CD40/TIMP3 protein level ratio in blood (OBA_2054218, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of metalloproteinase inhibitor 3 (human) in blood. Also known as: the ratio of amount of tumor necrosis factor receptor superfamily member 5 (human) in blood to amount of metalloproteinase inhibitor 3 (human) in blood.