CNPY4/MPI protein level ratio in blood (OBA_2054904, an Ontology of Biological Attributes entry) 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 mannose-6-phosphate isomerase (human) in blood. Also known as: the ratio of amount of protein canopy homolog 4 (human) in blood to amount of mannose-6-phosphate isomerase (human) in blood.