APOM/ERBB3 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2055175) can be described as follows. A compound attribute that is the ratio of amount of apolipoprotein M (human) in blood to amount of receptor tyrosine-protein kinase erbB-3 (human) in blood. Also known as: the ratio of amount of apolipoprotein M (human) in blood to amount of receptor tyrosine-protein kinase erbB-3 (human) in blood.