A compound attribute that is the ratio of amount of proline/serine-rich coiled-coil protein 1 (human) in blood to amount of mothers against decapentaplegic homolog 1 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2053208 (PSRC1/SMAD1 protein level ratio in blood). Also known as: the ratio of amount of proline/serine-rich coiled-coil protein 1 (human) in blood to amount of mothers against decapentaplegic homolog 1 (human) in blood.