A compound attribute that is the ratio of amount of glutathione-specific gamma-glutamylcyclotransferase 2 (human) in blood to amount of GMP reductase 1 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2055557 (CHAC2/GMPR protein level ratio in blood). Also known as: the ratio of amount of glutathione-specific gamma-glutamylcyclotransferase 2 (human) in blood to amount of GMP reductase 1 (human) in blood.