Antigen
An antigen is any substance that triggers an immune response in the body. It can be a molecule, such as a protein, carbohydrate, or lipid, that the immune system recognizes as foreign or harmful.
What It Is?
Antigens are typically found on the surface of pathogens like bacteria, viruses, or fungi. Still, they can also include toxins, allergens, or even abnormal cells within the body, such as cancer cells.
Why It's Important?
When the immune system detects an antigen, it produces antibodies or activates immune cells to neutralize or eliminate the threat. Antigens are the targets the immune system identifies and combats to protect the body from illness.
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