CLIP2/PLXNA4 protein level ratio in blood (OBA_2055007, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of CAP-Gly domain-containing linker protein 2 (human) in blood to amount of plexin-A4 (human) in blood. Also known as: the ratio of amount of CAP-Gly domain-containing linker protein 2 (human) in blood to amount of plexin-A4 (human) in blood.