A compound attribute that is the ratio of amount of allograft inflammatory factor 1 (human) in blood to amount of thiopurine S-methyltransferase (human) in blood. The trait is OBA_2053658 (AIF1/TPMT protein level ratio in blood). Also known as: the ratio of amount of allograft inflammatory factor 1 (human) in blood to amount of thiopurine S-methyltransferase (human) in blood.