A compound attribute that is the ratio of amount of complement C2 (human) in blood to amount of soluble scavenger receptor cysteine-rich domain-containing protein SSC5D (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053179 (C2/SSC5D protein level ratio in blood). Also known as: the ratio of amount of complement C2 (human) in blood to amount of soluble scavenger receptor cysteine-rich domain-containing protein SSC5D (human) in blood.