HBB and autosomal dominant cerebellar ataxia: Five SCA patients (mean ± standard deviation [SD] age 43 ± 8 years; 80% female; mean ± SD hemoglobin concentration 73 ± 13 g/L) and 5 African-American control individuals without HBB mutation (mean ± SD age 44 ± 8 years; 100% female; mean ± SD hemoglobin concentration 130 ± 7.8 g/L) from the University of Illinois at Chicago (UIC) were studied.