Ontology of Biological Attributes entry OBA_2054601 (CPXM1/SPARC protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of probable carboxypeptidase X1 (human) in blood to amount of SPARC protein (human) in blood. Also known as: the ratio of amount of probable carboxypeptidase X1 (human) in blood to amount of SPARC protein (human) in blood.