EREG/TIMP3 protein level ratio in blood (OBA_2054752, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of proepiregulin (human) in blood to amount of metalloproteinase inhibitor 3 (human) in blood. Also known as: the ratio of amount of proepiregulin (human) in blood to amount of metalloproteinase inhibitor 3 (human) in blood.