A compound attribute that is the ratio of amount of Fc receptor-like protein 6 (human) in blood to amount of natural killer cells antigen CD94 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2055307 (FCRL6/KLRD1 protein level ratio in blood). Also known as: the ratio of amount of Fc receptor-like protein 6 (human) in blood to amount of natural killer cells antigen CD94 (human) in blood.