GSTM1 and blood disease: Our pediatric center of blood diseases diagnosed a child (the proband) (G5-4, Fig. 1a, red arrow), who manifested anemia with Hb at 59 g/L and reticulocytes at 0.0025 × 1012/L in peripheral blood since the 24th day after birth (Fig. 1b and Supplementary Fig. 1a).