APRT/EREG protein level ratio in blood (OBA_2053924) can be described as follows. A compound attribute that is the ratio of amount of adenine phosphoribosyltransferase (human) in blood to amount of proepiregulin (human) in blood. Also known as: the ratio of amount of adenine phosphoribosyltransferase (human) in blood to amount of proepiregulin (human) in blood.