A compound attribute that is the ratio of amount of early activation antigen CD69 (human) in blood to amount of plexin-A4 (human) in blood. The trait is CD69/PLXNA4 protein level ratio in blood (OBA_2053351). Also known as: the ratio of amount of early activation antigen CD69 (human) in blood to amount of plexin-A4 (human) in blood.