title: UV-induction of reversions to prototrophy susceptible to mutation frequency decline.
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis; D003470:Culture Media; D004247:DNA / Q000096:biosynthesis; D004261:DNA Replication; D004926:Escherichia coli / Q000378:metabolism / Q000528:radiation effects*; D005815:Genetic Code; D009154:Mutation; D011830:Radiation Effects; D014364:Tryptophan / Q000096:biosynthesis; D014466:Ultraviolet Rays
chemical_list: D001426:Bacterial Proteins; D003470:Culture Media; D014364:Tryptophan; D004247:DNA