title: Tryptophan production by mutant strains of Escherichia coli K12.
mesh_terms: D004926:Escherichia coli / Q000378:metabolism / Q000528:radiation effects*; D009153:Mutagens; D011830:Radiation Effects; D014364:Tryptophan / Q000096:biosynthesis*; D014466:Ultraviolet Rays
chemical_list: D009153:Mutagens; D014364:Tryptophan