A compound attribute that is the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood. The trait is ESAM/PDGFB protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054758). Also known as: the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of platelet-derived growth factor subunit B (human) in blood.