A compound attribute that is the ratio of amount of serine/threonine-protein kinase 4 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood. The trait is STK4/VTA1 protein level ratio in blood (OBA_2053098). Also known as: the ratio of amount of serine/threonine-protein kinase 4 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood.