CD244/FCRL6 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2055379) can be described as follows. A compound attribute that is the ratio of amount of natural killer cell receptor 2B4 (human) in blood to amount of Fc receptor-like protein 6 (human) in blood. Also known as: the ratio of amount of natural killer cell receptor 2B4 (human) in blood to amount of Fc receptor-like protein 6 (human) in blood.