title: Repair systems and nitrous acid mutagenesis in E. coli B-r.
mesh_terms: D002110:Caffeine / Q000494:pharmacology; D002364:Caseins / Q000494:pharmacology; D003470:Culture Media; D004269:DNA, Bacterial; D004926:Escherichia coli; D009153:Mutagens / Q000037:antagonists & inhibitors; D009154:Mutation / Q000187:drug effects*; D009573:Nitrites / Q000494:pharmacology*; D011492:Protein Hydrolysates; D011995:Recombination, Genetic; D013489:Suppression, Genetic; D014364:Tryptophan / Q000378:metabolism
chemical_list: D002364:Caseins; D003470:Culture Media; D004269:DNA, Bacterial; D009153:Mutagens; D009573:Nitrites; D011492:Protein Hydrolysates; D002110:Caffeine; D014364:Tryptophan