Ontology of Biological Attributes id OBA_2055103 (CXCL5/PLXNA4 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of C-X-C motif chemokine 5 (human) in blood to amount of plexin-A4 (human) in blood. Also known as: the ratio of amount of C-X-C motif chemokine 5 (human) in blood to amount of plexin-A4 (human) in blood.