Cockayne SyndromeDNA Repair EnzymesXeroderma PigmentosumDNA HelicasesDNA RepairPhotosensitivity DisordersUltraviolet RaysSyndromeTranscription Factor TFIIHEnophthalmosDwarfismXeroderma Pigmentosum Group D ProteinDNA DamageAging, PrematureEndonucleasesNuclear Receptor Subfamily 2, Group C, Member 2RNA Polymerase IISkin Diseases, GeneticMutant Chimeric ProteinsXeroderma Pigmentosum Group A ProteinTrichothiodystrophy SyndromesTranscription, GeneticTranscription FactorsTranscription Factors, TFIIGuanineFibroblastsGenetic Complementation TestMutationDNA-Binding ProteinsFatal OutcomeCell Line, TransformedRadiation TolerancePyrimidine DimersDNAAdenosine TriphosphatasesNuclear ProteinsDown SyndromeCell LineMetabolic Syndrome X