Ampicillin can induce b-lactamase in in-vitro susceptibility testing. Why? I need an answer.

Torunn Pedersen Roekenes Torunnr at
Tue Jan 2 07:50:55 EST 1996

Transcription of the ampC promoter requires the AmpR activator 
protein. The ligand responsible for activation is NOT 
identical with the inducer ampicillin,and has not yet (to my 
knowledge) been identified.

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