MyoclonusOpsoclonus-Myoclonus SyndromeOcular Motility DisordersNeuroblastomaParaneoplastic Syndromes, Nervous SystemEpilepsies, MyoclonicMyoclonic Epilepsies, ProgressiveLafora DiseaseUnverricht-Lundborg SyndromeCystatin BClonazepamReflex, AbnormalMyoclonic Cerebellar DyssynergiaEvoked Potentials, SomatosensoryMERRF SyndromeProtein Tyrosine Phosphatases, Non-ReceptorLisurideMuscle RigidityElectroencephalographyElectromyographyCell Line, TumorGanglioneuromaCerebellar AtaxiaAtaxiaTumor Cells, CulturedOncogene Proteins