Ontology of Biological Attributes id OBA_2054902 (CNPY4/MANF protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of protein canopy homolog 4 (human) in blood to amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood. Also known as: the ratio of amount of protein canopy homolog 4 (human) in blood to amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood.