A compound attribute that is the ratio of amount of C-C motif chemokine 22 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is CCL22/PDGFB protein level ratio in blood (OBA_2054702, an Ontology of Biological Attributes id). Also known as: the ratio of amount of C-C motif chemokine 22 (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.