CST3/RARRES2 protein level ratio in blood (OBA_2054477) can be described as follows. A compound attribute that is the ratio of amount of cystatin-C (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood. Also known as: the ratio of amount of cystatin-C (human) in blood to amount of retinoic acid receptor responder protein 2 (human) in blood.