Inactivation of the survival motor neuron gene, a candidate gene for human spinal muscular atrophy, leads to massive cell death in early mouse embryos. - Schrank,B.; Götz,R.; Gunnersen,J.M.; Ure,J.M.; Toyka,K.V.; Smith,A.G.; Sendtner,M. (Proc Natl Acad Sci USA, 1997)