SkinKeratinocytesUltraviolet RaysMelanocytesFibroblastsEpidermisSkin NeoplasmsCells, CulturedSkin AgingDose-Response Relationship, RadiationEmbryo, MammalianSkin Physiological PhenomenaEmbryo, NonmammalianChick EmbryoSkin, ArtificialDermisSkin DiseasesSkin PigmentationEmbryo ImplantationBlastocystSkin AbsorptionEmbryonic DevelopmentSunlightResearch PersonnelMice, HairlessCysteamineWound HealingMelaninsEmbryo LossGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentSkin TestsRNA, MessengerAdministration, TopicalCell LineFertilization in VitroPregnancyPyrimidine DimersCleavage Stage, OvumBlastomeresCell DifferentiationDNA DamageOxidative StressErythemaBase SequencePhotosensitizing AgentsKeratinsMelanomaCell Line, TransformedModels, BiologicalImmunohistochemistryGene ExpressionCell SurvivalCell DivisionApoptosisGene Expression RegulationSignal TransductionBiomedical ResearchEmbryo Disposition