title: Letter: Limited usefulness of artificial light sources.
mesh_terms: D002338:Carotenoids / Q000627:therapeutic use; D006801:Humans; D008027:Light; D011164:Porphyrias / Q000188:drug therapy; D011837:Radiation-Protective Agents / Q000627:therapeutic use; D013472:Sunlight; D014466:Ultraviolet Rays / Q000009:adverse effects; D014978:Xenon
chemical_list: D011837:Radiation-Protective Agents; D002338:Carotenoids; D014978:Xenon