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What is Sir Alexander Fleming got Nobel Prix for and explain in detail?
List of Nobel Laureates

Willem Einthoven : ECG.
Sir Alexander Fleming : Penicillin.
Paul. H. Muller : DDT.
Sir Godfrey N.Hounsfield : Human blood groups.
Karl Landsteiner : Human blood groups.
Paul Ehrlich : Immunity.
Sir Peter Mansfield : MRI.