A compound attribute that is the ratio of amount of DNA repair nuclease/redox regulator APEX1 (human) in blood to amount of hematopoietic lineage cell-specific protein (human) in blood. The trait is APEX1/HCLS1 protein level ratio in blood (OBA_2055167). Also known as: the ratio of amount of DNA repair nuclease/redox regulator APEX1 (human) in blood to amount of hematopoietic lineage cell-specific protein (human) in blood.