Ontology of Biological Attributes identifier OBA_2054355 (IGFBP6/MFAP5 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of microfibrillar-associated protein 5 (human) in blood. Also known as: the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of microfibrillar-associated protein 5 (human) in blood.