AIFM1/PLXNA4 protein level ratio in blood (OBA_2053710, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of apoptosis-inducing factor 1, mitochondrial (human) in blood to amount of plexin-A4 (human) in blood. Also known as: the ratio of amount of apoptosis-inducing factor 1, mitochondrial (human) in blood to amount of plexin-A4 (human) in blood.