Cockayne SyndromeDNA Repair EnzymesXeroderma PigmentosumDNA HelicasesPhotosensitivity DisordersDNA RepairUltraviolet RaysTranscription Factor TFIIHDwarfismEnophthalmosXeroderma Pigmentosum Group D ProteinDNA DamageEndonucleasesAging, PrematureNuclear Receptor Subfamily 2, Group C, Member 2RNA Polymerase IIMutant Chimeric ProteinsSkin Diseases, GeneticXeroderma Pigmentosum Group A ProteinTrichothiodystrophy SyndromesTranscription, GeneticTranscription FactorsTranscription Factors, TFIIGuanineGenetic Complementation TestFibroblastsFatal OutcomeDNA-Binding ProteinsCell Line, TransformedRadiation TolerancePyrimidine DimersMutationDNAAdenosine TriphosphatasesNuclear Proteins