Q. Glutathione is a factor that protects RBCs from oxidative stress by reducing free radicals. A 35-year-old man is brought to the ER by his wife because of multiple severe abdominal pain episodes, fatigue, and memory problems. On clinical examination, there is a blue line on the gums, dropping of his wrist and feet, and pale conjunctiva. If you know that he has low hemoglobin with decreased MCV and normal Iron studies, which of the following is consistent with this condition?