A compound attribute that is the ratio of amount of CMRF35-like molecule 2 (human) in blood to amount of ephrin-A4 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054186 (CD300E/EFNA4 protein level ratio in blood). Also known as: the ratio of amount of CMRF35-like molecule 2 (human) in blood to amount of ephrin-A4 (human) in blood.