A compound attribute that is the ratio of amount of cystatin-M (human) in blood to amount of fatty acid-binding protein 9 (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2054483 (CST6/FABP9 protein level ratio in blood). Also known as: the ratio of amount of cystatin-M (human) in blood to amount of fatty acid-binding protein 9 (human) in blood.