KLRB1/KLRD1 protein level ratio in blood (OBA_2055539) can be described as follows. A compound attribute that is the ratio of amount of killer cell lectin-like receptor subfamily B member 1 (human) in blood to amount of natural killer cells antigen CD94 (human) in blood. Also known as: the ratio of amount of killer cell lectin-like receptor subfamily B member 1 (human) in blood to amount of natural killer cells antigen CD94 (human) in blood.