A compound attribute that is the ratio of amount of ephrin type-B receptor 4 (human) in blood to amount of endothelial cell-selective adhesion molecule (human) in blood. The trait is EPHB4/ESAM protein level ratio in blood (OBA_2054723, an Ontology of Biological Attributes id). Also known as: the ratio of amount of ephrin type-B receptor 4 (human) in blood to amount of endothelial cell-selective adhesion molecule (human) in blood.