A compound attribute that is the ratio of amount of natural killer cell receptor 2B4 (human) in blood to amount of cytotoxic and regulatory T-cell molecule (human) in blood. The trait is OBA_2055377 (CD244/CRTAM protein level ratio in blood). Also known as: the ratio of amount of natural killer cell receptor 2B4 (human) in blood to amount of cytotoxic and regulatory T-cell molecule (human) in blood.