Immune Cells

3. A type of white blood cell that produces a single type of antibody.
6. A toxin or other foreign substance that induces an immune response in the body.
7. Small proteins important in cell signaling, produced by cells in the immune system.
10. A white blood cell that engulfs and destroys bacteria.
13. A white blood cell involved in combating multicellular parasites and certain infections.
15. A circulating leukocyte that produces histamine.
17. A type of lymphocyte that plays a central role in cell-mediated immunity.
18. A family of small cytokines, or signaling proteins secreted by cells.
19. A lymphocyte able to bind to certain tumor cells and virus-infected cells without the stimulation of antigens.
20. A type of white blood cell that can differentiate into a macrophage or dendritic cell.

1. Antigen-presenting cells that process antigen material and present it to T-cells.
2. A type of cell within the body capable of engulfing and absorbing bacteria and other small cells and particles.
4. Another term for white blood cells, which are part of the immune system.
5. A large phagocytic cell that can ingest pathogens or dead cells.
8. A class of proteins which function as antibodies.
9. An immune cell that produces antibodies.
11. A blood protein produced in response to and counteracting a specific antigen.
12. Cells that play a role in allergies and anaphylaxis.
14. A subtype of white blood cell in a vertebrate's immune system.
16. A group of cytokines that were first seen to be expressed by white blood cells (leukocytes).