Cloning, OrganismSkinKeratinocytesUltraviolet RaysMelanocytesFibroblastsEpidermisSkin NeoplasmsCells, CulturedSkin AgingDose-Response Relationship, RadiationSkin Physiological PhenomenaSkin, ArtificialDermisSkin DiseasesSkin PigmentationSkin AbsorptionCloning, MolecularSunlightMice, HairlessBase SequenceCysteamineMolecular Sequence DataMelaninsWound HealingSkin TestsCell LineAdministration, TopicalRNA, MessengerAmino Acid SequencePyrimidine DimersDNA DamageOxidative StressErythemaPhotosensitizing AgentsMelanomaKeratinsCell Line, TransformedGene ExpressionGene Expression RegulationDNACell SurvivalSkin TransplantationCell DifferentiationApoptosisImmunohistochemistryCell Division