Ontology of Biological Attributes id OBA_2055318 (ESAM/VSIR protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood. Also known as: the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood.