Antigens: Types, How They Work, Testing, and More - Verywell …
https://www.verywellhealth.com:443/what-is-an-antigen-5083801
WEBJan 16, 2024 · Role of Antibodies. An antigen is a molecule that may be recognized by the immune system and trigger an immune response by activating leukocytes (white blood cells) that fight disease. Antigens may be present on invaders, such as bacteria, viruses, parasites, fungi, and transplanted organs, or on abnormal cells, such as cancer cells.
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