A compound attribute that is the ratio of amount of protein phosphatase 1 regulatory subunit 12A (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053502 (PPP1R12A/VTA1 protein level ratio in blood). Also known as: the ratio of amount of protein phosphatase 1 regulatory subunit 12A (human) in blood to amount of vacuolar protein sorting-associated protein VTA1 homolog (human) in blood.