A compound attribute that is the ratio of amount of CD99 antigen (human) in blood to amount of CD99 antigen-like protein 2 (human) in blood. The trait is CD99/CD99L2 protein level ratio in blood (OBA_2053394). Also known as: the ratio of amount of CD99 antigen (human) in blood to amount of CD99 antigen-like protein 2 (human) in blood.