Motor NeuronsNeural Stem CellsStem CellsHedgehog ProteinsNeuronsMotor Neuron DiseaseCell DifferentiationGene Expression Regulation, DevelopmentalHomeodomain ProteinsSurvival of Motor Neuron 1 ProteinNeurons, AfferentMotor CortexSurvival of Motor Neuron 2 ProteinEvoked Potentials, MotorSpinal CordAmyotrophic Lateral SclerosisMuscular Atrophy, SpinalMotor ActivityHematopoietic Stem CellsNerve Tissue ProteinsCells, CulturedAxonsSMN Complex ProteinsAction PotentialsMice, TransgenicCell LineageMice, Inbred C57BLMyeloid Progenitor CellsMolecular Motor ProteinsElectric StimulationImmunohistochemistryNerve DegenerationSynapsesGanglia, InvertebrateNeurogenesisNeuromuscular DiseasesInterneuronsCell CountElectrophysiologyTime FactorsSynaptic TransmissionAnimals, NewbornAntigens, CD34BrainMovementDopaminergic NeuronsCholinergic NeuronsDisease Models, AnimalAplysiaGreen Fluorescent ProteinsCerebral CortexMice, KnockoutSuperoxide Dismutase