A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of Fc receptor-like protein 5 (human) in blood. The trait is CD27/FCRL5 protein level ratio in blood (OBA_2055386). Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of Fc receptor-like protein 5 (human) in blood.