GSTM1 and thalassemia: Even though the T2* in IUGT 32 Weeks was similar to uninjected Thalassemia Control group, representative Pearl stains from an animal with successful correction of the defect (HB:12.5g/dl) showed less iron pigmentation compared to an untreated thalassemia control (Hb:9.0g/dl) (Fig. 4A).