GSTM1 and autosomal dominant cerebellar ataxia: Individuals with SCA (Hb SS) consistently had a low average of blood Hb concentration 7.0 ± 1.1 g/dl, normal MCV 92.4 ± 7.4 fl and high TWBCs 17.3 ± 15.1 × 103/μL in comparison to the SCT.