Positive selection of a pre-expansion CAG repeat of the human SCA2 gene. oleh Fuli Yu, Pardis C Sabeti, Paul Hardenbol, Qing Fu, Ben Fry, Xiuhua Lu, Sy Ghose, Richard Vega, Ag Perez, Shiran Pasternak, Suzanne M Leal, Thomas D Willis, David L Nelson, John Belmont, Richard A Gibbs