Across
- 3. - The first line of defense in the immune system.
- 4. - Immune cell that targets infected cells.
- 6. - A condition where the immune system attacks self.
- 7. - The immune system's targeted response.
- 8. - The study of the immune system.
- 12. - A substance that elicits an immune response.
Down
- 1. - An organism that causes disease.
- 2. - Localized redness, heat, and swelling.
- 5. - Y-shaped protein that binds to antigens.
- 9. - Immune cell known for engulfing pathogens.
- 10. - Biological preparation that provides immunity.
- 11. - A signaling molecule that modulates immune responses.