OBA_2055304 (FCRL5/MZB1 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of Fc receptor-like protein 5 (human) in blood to amount of marginal zone B- and B1-cell-specific protein (human) in blood. Also known as: the ratio of amount of Fc receptor-like protein 5 (human) in blood to amount of marginal zone B- and B1-cell-specific protein (human) in blood.