A compound attribute that is the ratio of amount of sulfotransferase 1A1 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood. The trait is SULT1A1/VTA1 protein level ratio in blood (OBA_2053102). Also known as: the ratio of amount of sulfotransferase 1A1 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood.