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Antigens are molecules that trigger an immune response, making them critical components in immunology research, diagnostics, and vaccine development. These molecules, typically proteins, peptides, or polysaccharides, are recognized by the immune system, enabling the identification and targeting of pathogens, abnormal cells, or allergens. Whether you're studying immune responses, developing diagnostic tests, or creating vaccines, antigens are indispensable tools for advancing research and healthcare solutions.