A compound attribute that is the ratio of amount of caspase-3 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054773 (CASP3/PDGFB protein level ratio in blood). Also known as: the ratio of amount of caspase-3 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.