A compound attribute that is the ratio of amount of carbonic anhydrase 1 (human) in blood to amount of carbonic anhydrase 2 (human) in blood. The trait is CA1/CA2 protein level ratio in blood (OBA_2055729). Also known as: the ratio of amount of carbonic anhydrase 1 (human) in blood to amount of carbonic anhydrase 2 (human) in blood.