A compound attribute that is the ratio of amount of arginase-1 (human) in blood to amount of porphobilinogen deaminase (human) in blood. The trait is OBA_2053929 (ARG1/HMBS protein level ratio in blood). Also known as: the ratio of amount of arginase-1 (human) in blood to amount of porphobilinogen deaminase (human) in blood.