Across
- 1. Cell A type of antigen-presenting immune cell.
- 3. A type of white blood cell that mediates acquired immunity.
- 5. System keep germs and other unknown substances out of the body and destroy any that get in.
- 6. An organism or virus that causes disease.
Down
- 2. A type of protein that is made by certain immune and non-immune cells and has an effect on the immune system
- 4. Any substance that causes the body to make an immune response against that substance.