DNA Repeat ExpansionFrontotemporal DementiaAmyotrophic Lateral SclerosisTrinucleotide Repeat ExpansionFrontotemporal Lobar DegenerationRepetitive Sequences, Nucleic AcidTrinucleotide RepeatsProteinsAge of OnsetChromosomes, Human, Pair 9Base SequenceNeuronsTandem Repeat SequencesPedigreeMolecular Sequence DataDNAMyotonic DystrophyFriedreich AtaxiaNucleic Acid ConformationTelomereSpinocerebellar DegenerationsMicrosatellite RepeatsDNA-Binding ProteinsHuntington DiseaseSpinocerebellar AtaxiasFragile X SyndromeNeurons, AfferentMinisatellite RepeatsMutationFragile X Mental Retardation ProteinPolymerase Chain ReactionMotor NeuronsNerve Tissue ProteinsRepetitive Sequences, Amino AcidPoly AAmino Acid SequenceInverted Repeat SequencesRahnellaRNA, MessengerTranscription, GeneticAllelesHeredodegenerative Disorders, Nervous System