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Yeast called any of several microscopic single-celled fungi that are important for their ability to perform the decomposition by fermentation of various organic bodies, especially sugars or carbohydrates, producing various substances. Yeasts have been used since prehistoric times in the production of bread and wine, currently various uses: as a source of B vitamins and thiamine, in some stages of production of antibiotics and steroid hormones, and as food for animals and humans.