Infantile-onset symptomatic epilepsy syndrome caused by a homozygous loss-of-function mutation of GM3 synthase. by Simpson, M, Cross, H, Proukakis, C, Priestman, D, Neville, D, Reinkensmeier, G, Wang, H, Wiznitzer, M, Gurtz, K, Verganelaki, A, Pryde, A, Patton, M, Dwek, R, Butters, T, Platt, F, Crosby, A