 |  |
 |
  |
 | ||||||
| Antigen A substance, often a protein or large polysaccharide, which is perceived as foreign by the body and stimulates an immune response. Components of microbes--such as cell walls, flagella, toxins, and the coats of viruses--can serve as antigens.
Read more about this term in the Online Textbook: HIV and AIDS: The Immune System Related Terms: None Related Images: The Central Role of Helper T Cells Cytoxic T Cell and Antigen Interaction Related Animations: Immune System Overview View QuickTime Movie
| | ||||
| ||||||