A compound attribute that is the ratio of amount of caspase-3 (human) in blood to amount of serpin B9 (human) in blood. The trait is CASP3/SERPINB9 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054777). Also known as: the ratio of amount of caspase-3 (human) in blood to amount of serpin B9 (human) in blood.