SELP/VSIR protein level ratio in blood (OBA_2055749) can be described as follows. A compound attribute that is the ratio of amount of P-selectin (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 P-selectin (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood.