A compound attribute that is the ratio of amount of pre-pro-epidermal growth factor (human) in blood to amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood. The trait is EGF/MANF protein level ratio in blood (OBA_2055603, an Ontology of Biological Attributes identifier). Also known as: the ratio of amount of pre-pro-epidermal growth factor (human) in blood to amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood.