Muscular Atrophy, SpinalSMN Complex ProteinsSpinal Muscular Atrophies of ChildhoodSurvival of Motor Neuron 1 ProteinBulbo-Spinal Atrophy, X-LinkedMuscular Disorders, AtrophicSurvival of Motor Neuron 2 ProteinRibonucleoproteins, Small NuclearAtrophyMuscular AtrophyReceptors, AndrogenMotor NeuronsSpinal CordNeuronal Apoptosis-Inhibitory ProteinCyclic AMP Response Element-Binding ProteinMotor Neuron DiseaseAnterior Horn CellsBulbar Palsy, ProgressiveRNA-Binding ProteinsTrinucleotide Repeat ExpansionNerve Tissue ProteinsTrinucleotide RepeatsIntranuclear Inclusion BodiesDisease Models, AnimalDEAD Box Protein 20Spinal Cord InjuriesInclusion BodiesMice, TransgenicChromosomes, Human, Pair 5ExonsNerve DegenerationCoiled BodiesSpinal Cord DiseasessnRNP Core ProteinsOptic AtrophyPeptidesMutationAndrogensPedigreeHeterozygote DetectionMuscle, SkeletalMultiple System AtrophyGlycine-tRNA LigasePhenotypeGene Deletion