COL6A3/SMOC2 protein level ratio in blood (OBA_2053805, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of collagen alpha-3(VI) chain (human) in blood to amount of SPARC-related modular calcium-binding protein 2 (human) in blood. Also known as: the ratio of amount of collagen alpha-3(VI) chain (human) in blood to amount of SPARC-related modular calcium-binding protein 2 (human) in blood.