title: AmpB a mutation which affects the cell envelope and ampicillin resistance in Escherichia coli.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D002462:Cell Membrane; D004926:Escherichia coli / Q000201:enzymology*; D009154:Mutation; D010403:Penicillin Resistance; D010405:Penicillinase / Q000378:metabolism
chemical_list: D000667:Ampicillin; D010405:Penicillinase