Dominant mutations in GRM1 cause spinocerebellar ataxia type 44 by Watson, L, Bamber, E, Schnekenberg, R, Williams, J, Bettencourt, C, Lickiss, J, Fawcett, K, Clokie, S, Wallis, Y, Clouston, P, Sims, D, Houlden, H, Becker, E, Németh, A