A compound attribute that is the ratio of amount of DNA repair nuclease/redox regulator APEX1 (human) in blood to amount of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2055171 (APEX1/NMNAT1 protein level ratio in blood). Also known as: the ratio of amount of DNA repair nuclease/redox regulator APEX1 (human) in blood to amount of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) in blood.