Friedreich AtaxiaIron-Binding ProteinsNeurodegenerative DiseasesAtaxiaTrinucleotide Repeat ExpansionCerebellar AtaxiaTrinucleotide RepeatsReflex, BabinskiDNA Repeat ExpansionSpinocerebellar AtaxiasIron-Sulfur ProteinsIronAconitate HydrataseMitochondriaPhosphotransferases (Alcohol Group Acceptor)Chromosomes, Human, Pair 9Oxidative StressUbiquinoneNerve DegenerationGait AtaxiaDisease Models, AnimalMutationCardiomyopathiesAmyotrophic Lateral SclerosisNeurons