A compound attribute that is the ratio of amount of Fc receptor-like protein 5 (human) in blood to amount of tumor necrosis factor receptor superfamily member 13B (human) in blood. The trait is FCRL5/TNFRSF13B protein level ratio in blood (OBA_2055305, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of Fc receptor-like protein 5 (human) in blood to amount of tumor necrosis factor receptor superfamily member 13B (human) in blood.