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Immunogen

/ɪˈmjuːnədʒən/noun
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An immunogen is a substance, such as a protein or polysaccharide, that provokes an immune response in the body by stimulating the production of antibodies or T-cells. In modern applications, it's a cornerstone of vaccine design and immunotherapy, allowing scientists to harness the body's defenses against specific diseases without triggering full-blown illness.

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Remarkably, the concept of an immunogen was pivotal in the 1796 smallpox vaccine developed by Edward Jenner, which used cowpox material to confer immunity and ultimately eradicated the disease worldwide, saving an estimated 530 million lives in the 20th century alone.

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