ATG4A/TPMT protein level ratio in blood (OBA_2054109) can be described as follows. A compound attribute that is the ratio of amount of cysteine protease ATG4A (human) in blood to amount of thiopurine S-methyltransferase (human) in blood. Also known as: the ratio of amount of cysteine protease ATG4A (human) in blood to amount of thiopurine S-methyltransferase (human) in blood.