A compound attribute that is the ratio of amount of plexin-B2 (human) in blood to amount of semaphorin-7A (human) in blood. The trait is OBA_2053528 (PLXNB2/SEMA7A protein level ratio in blood). Also known as: the ratio of amount of plexin-B2 (human) in blood to amount of semaphorin-7A (human) in blood.