As a group of polysaccharides (sometimes referred to as "complex carbohydrates"), beta-glucans are derived from algae, bacteria, fungi (including yeast), and plants, among others. Considerable interest has been devoted to their immunomodulatory properties and potential health benefits in the fields of biotechnology, medicine, and nutrition. The structure of beta-glucans resembles long chains of glucose molecules that are either linear or branched. Beta-glucans are classified into various variants as a result of minute variations in the configuration of these glucose molecules and the types of bonds that connect them. Particularly those comprising the genus Saccharomyces, the cell walls of specific fungi are recognized as a rich source of beta-glucans. Baker's yeast and medicinal mushrooms such as reishi, shiitake, and maitake are examples of these fungi.
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