Anterior Horn CellsSpinal CordSpinal Muscular Atrophies of ChildhoodMuscular Atrophy, SpinalNeuronal Apoptosis-Inhibitory ProteinMotor NeuronsSpinal Cord InjuriesSpinal Cord DiseasesSMN Complex ProteinsSurvival of Motor Neuron 1 ProteinMuscular AtrophySpinal Nerve RootsElectromyographyHedgehog ProteinsHornsPosterior Horn CellsOligodendrogliaSemaphorin-3AAxonsNerve Tissue ProteinsInterneuronsChick EmbryoGanglia, SpinalZebrafishNeuronsParalysisSpinal Cord CompressionIn Situ HybridizationSpinal Cord NeoplasmsGene Expression Regulation, Developmentalp-AminoazobenzeneMenisci, TibialArthrogryposisZebrafish ProteinsCentral Nervous SystemMotor Neuron DiseaseNeuromuscular DiseasesCell DifferentiationNeurons, AfferentStem CellsSpinal Cord IschemiaNerve Growth FactorsHomeodomain ProteinsAmyotrophic Lateral SclerosisCell LineageBasic Helix-Loop-Helix Transcription FactorsInjections, SpinalBody PatterningNeural ConductionMice, Mutant StrainsCatsSignal TransductionTrans-Activators