A compound attribute that is the ratio of amount of myeloperoxidase (human) in blood to amount of eosinophil cationic protein (human) in blood. The trait is MPO/RNASE3 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054553). Also known as: the ratio of amount of myeloperoxidase (human) in blood to amount of eosinophil cationic protein (human) in blood.