title: Letter: Pyrimidine dimer excision and mutation frequency decline.
mesh_terms: D004260:DNA Repair; D004277:DNA, Single-Stranded / Q000528:radiation effects*; D004926:Escherichia coli / Q000528:radiation effects*; D009154:Mutation; D011742:Pyrimidine Nucleotides; D011831:Radiation Genetics; D013936:Thymidine; D013942:Thymine Nucleotides; D014316:Tritium; D014466:Ultraviolet Rays
chemical_list: D004277:DNA, Single-Stranded; D011742:Pyrimidine Nucleotides; D013942:Thymine Nucleotides; D014316:Tritium; D013936:Thymidine