A compound attribute that is the ratio of amount of junctional adhesion molecule A (human) in blood to amount of plexin-A4 (human) in blood. The trait is F11R/PLXNA4 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2055321). Also known as: the ratio of amount of junctional adhesion molecule A (human) in blood to amount of plexin-A4 (human) in blood.