Glutathione Response of Human Red Blood Cells to Acute and Chronic Oxidant Challenge as Observed Through the Glutathione and Glutathionyl Hemoglobin Redox Pairs In Vitro and In Vivo Glutathione Reductase Stock Image Science Source Images Although G6PD deficiency, which can cause problems in red blood cells upon certain triggers, is the most common human enzyme defect, affecting over 400 million people, including over 1 in 10 Black L glutamine for sickle cell disease: Knight or pawn? Alina Sadaf, Charles T Quinn, 2020