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Antigens are molecules or molecular structures that are recognized by the immune system, specifically by antibodies or T-cell receptors, and can trigger an immune response. They are typically proteins, polysaccharides, or glycoproteins present on the surface of pathogens such as bacteria, viruses, fungi, or parasites, as well as on non-infectious substances like pollen, transplanted tissues, and even abnormal cells. The fundamental _________ _________ _____ _________ ________ __________ ____.
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