FasciculationCell DifferentiationAxonsSuccinylcholineContactin 2Cell Adhesion Molecules, NeuronalCell Adhesion Molecules, Neuron-GliaGene Expression Regulation, DevelopmentalCells, CulturedNeuritesSemaphorin-3ALeukocyte L1 Antigen ComplexNeural Cell Adhesion Molecule L1Neural Cell Adhesion MoleculesNeuropilin-1Nerve Tissue ProteinsMotor NeuronsNervous SystemMuscle CrampNeurologic ManifestationsNeuromuscular DiseasesChick EmbryoNeuronsSignal TransductionStem CellsElectromyographyMotor Neuron DiseaseAbducens NerveContactinsTranscription FactorsMolecular Sequence DataSex DifferentiationCranial NervesEmbryo, NonmammalianVomeronasal OrganCell LinePhenotypeEmbryonic Stem CellsCell LineageImmunohistochemistryMice, Inbred C57BLGrowth ConesCell Adhesion MoleculesNeuropilin-2Mice, KnockoutCell Division