A compound attribute that is the ratio of amount of CD99 antigen (human) in blood to amount of phosphoinositide-3-kinase-interacting protein 1 (human) in blood. The trait is OBA_2053400 (CD99/PIK3IP1 protein level ratio in blood). Also known as: the ratio of amount of CD99 antigen (human) in blood to amount of phosphoinositide-3-kinase-interacting protein 1 (human) in blood.