Penicillium mold growing on an agar plate inhibited the growth of Staphylococcus bacteria and led to the concept of

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Penicillium mold produces a substance that inhibits the growth of bacteria, leading to the discovery of antibiotics for bacterial control. This was a foundational observation by Alexander Fleming that led to the development of penicillin, the first widely used antibiotic.

Penicillium Mold Growing on an Agar Plate Inhibited the Growth