File:Scientist with laboratory rats, from an advertisement for Fleischmann’s yeast.jpg
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![File:Scientist with laboratory rats, from an advertisement for Fleischmann’s yeast.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/27/Scientist_with_laboratory_rats%2C_from_an_advertisement_for_Fleischmann%E2%80%99s_yeast.jpg/800px-Scientist_with_laboratory_rats%2C_from_an_advertisement_for_Fleischmann%E2%80%99s_yeast.jpg?20220209192505)
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