A compound attribute that is the ratio of amount of aminopeptidase N (human) in blood to amount of dipeptidyl peptidase 4 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054280 (ANPEP/DPP4 protein level ratio in blood). Also known as: the ratio of amount of aminopeptidase N (human) in blood to amount of dipeptidyl peptidase 4 (human) in blood.