A compound attribute that is the ratio of amount of cytotoxic and regulatory T-cell molecule (human) in blood to amount of Fc receptor-like protein 6 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054506 (CRTAM/FCRL6 protein level ratio in blood). Also known as: the ratio of amount of cytotoxic and regulatory T-cell molecule (human) in blood to amount of Fc receptor-like protein 6 (human) in blood.