A compound attribute that is the ratio of amount of promotilin (human) in blood to amount of tumor necrosis factor receptor superfamily member 12A (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054569 (MLN/TNFRSF12A protein level ratio in blood). Also known as: the ratio of amount of promotilin (human) in blood to amount of tumor necrosis factor receptor superfamily member 12A (human) in blood.