CD59/CST6 protein level ratio in blood (OBA_2054171, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of CD59 glycoprotein (human) in blood to amount of cystatin-M (human) in blood. Also known as: the ratio of amount of CD59 glycoprotein (human) in blood to amount of cystatin-M (human) in blood.