A compound attribute that is the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of endoribonuclease LACTB2 (human) in blood. The trait is CA13/LACTB2 protein level ratio in blood (OBA_2055720). Also known as: the ratio of amount of carbonic anhydrase 13 (human) in blood to amount of endoribonuclease LACTB2 (human) in blood.