A compound attribute that is the ratio of amount of plexin-B3 (human) in blood to amount of synaptosomal-associated protein 23 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2053529 (PLXNB3/SNAP23 protein level ratio in blood). Also known as: the ratio of amount of plexin-B3 (human) in blood to amount of synaptosomal-associated protein 23 (human) in blood.