The SCA1 (Spinocerebellar ataxia type 1) and MJD (Machado-Joseph disease) CAG repeats in normal individuals: segregation analysis and allele frenquencies - Wiezel, Cláudia Emília Vieira; Canas, Maria do Carmo Tomitão; Simões, Aguinaldo Luiz (Genetics and Molecular Biology, 2003)