Myasthenic Syndromes, CongenitalLambert-Eaton Myasthenic SyndromeMyasthenia GravisSyndromeReceptors, CholinergicMotor EndplateNeuromuscular Junction DiseasesParaneoplastic SyndromesNeuromuscular JunctionMuscular DiseasesNeuromuscular DiseasesMuscle WeaknessAcetylcholinesteraseCarcinoma, Small CellCholine O-AcetyltransferaseMutationCholinesterase InhibitorsDNA Mutational AnalysisMuscle ProteinsAutoantibodiesReceptors, NicotinicPedigreeElectromyography4-AminopyridineBungarotoxinsAcetylcholineDown SyndromeMetabolic Syndrome XMolecular Sequence DataPatch-Clamp TechniquesMuscle, SkeletalCalcium ChannelsSynaptic TransmissionLung NeoplasmsAmino Acid SequenceMusclesAction Potentials