title: Caffeine- and amino acid-effects upon try(plus) revertant yield in U.V.-irradiated hcr(plus) and hcr (minus) mutants of E. coli B-r.
mesh_terms: D000596:Amino Acids / Q000494:pharmacology*; D002110:Caffeine / Q000494:pharmacology*; D004926:Escherichia coli; D005827:Genetics, Microbial; D009154:Mutation; D011831:Radiation Genetics; D014364:Tryptophan / Q000096:biosynthesis / Q000494:pharmacology; D014466:Ultraviolet Rays
chemical_list: D000596:Amino Acids; D002110:Caffeine; D014364:Tryptophan