title: Mutants of Escherichia coli defective in the B protein of tryptophan synthetase. 3. Intragenic clustering.
mesh_terms: D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology; D005796:Genes; D008190:Lyases / Q000378:metabolism; D009153:Mutagens / Q000494:pharmacology; D009154:Mutation; D011995:Recombination, Genetic; D014161:Transduction, Genetic
chemical_list: D009153:Mutagens; D008190:Lyases