SkinKeratinocytesUltraviolet RaysMelanocytesFibroblastsEpidermisSkin NeoplasmsCells, CulturedSkin AgingDose-Response Relationship, RadiationEmbryo, MammalianSkin Physiological PhenomenaEmbryo, NonmammalianChick EmbryoSkin, ArtificialDermisSkin DiseasesSkin PigmentationEmbryo ImplantationBlastocystSkin AbsorptionEmbryonic DevelopmentSunlightMice, HairlessCysteamineWound HealingMelaninsEmbryo LossGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentSkin TestsRNA, MessengerAdministration, TopicalCell LineFertilization in VitroPyrimidine DimersCleavage Stage, OvumBlastomeresDNA DamageCell DifferentiationPregnancyOxidative StressErythemaPhotosensitizing AgentsKeratinsMelanomaBase SequenceCell Line, TransformedImmunohistochemistryCell SurvivalGene ExpressionCell DivisionEmbryo DispositionApoptosis