LasersUltraviolet RaysGasesUltraviolet TherapyLasers, Solid-StateSpectrophotometry, UltravioletLaser CoagulationLaser Therapy, Low-LevelRadiation EffectsPUVA TherapyErythemaLasers, ExcimerChromatography, GasSunscreening AgentsGas Chromatography-Mass SpectrometryMicroscopy, UltravioletDose-Response Relationship, RadiationSunlightSkinLasers, DyeNoble GasesPulmonary Gas ExchangeLaser Scanning CytometryMice, HairlessKeratomileusis, Laser In SituSkin Pigmentation