Penicillin is a group of antibiotics which include（）, Penicillin V, procaine penicillin and benzathine penicillin.

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• Fleming made his discovery by isolating the bacteria-killing substance found in the mould—penicillin.
• Penicillin is one of the biggest discoveries in Western medicine.
• Penicillin was discovered by accident in the summer of 1928.
• In 1941, Charles Fletcher used some of penicillin on his patient who was dying of bacterial infection, and the patient was saved
• In 1945, Alexander Fleming alone was awarded the Nobel Prize in Medicine for the discovery of penicillin.