DKK1/VTA1 protein level ratio in blood (OBA_2054015, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of dickkopf-related protein 1 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood. Also known as: the ratio of amount of dickkopf-related protein 1 (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood.