title: Photochemical alterations of pyrimidine bases: their importance in photobiology.
mesh_terms: D003503:Cyclobutanes; D004247:DNA / Q000528:radiation effects*; D008967:Molecular Biology; D009690:Nucleic Acid Conformation / Q000528:radiation effects; D010777:Photochemistry; D011744:Pyrimidinones / Q000528:radiation effects*; D011830:Radiation Effects; D014466:Ultraviolet Rays
chemical_list: D003503:Cyclobutanes; D011744:Pyrimidinones; D004247:DNA