- Secreted by helper T cells
- Proteins that help regulate the activity of B cells and phagocytes

Michigan State University

New York University

- Phagocytes
- B Lymphocytes
- Antibodies
- T Lymphocytes
- Cytokines

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

- "Eating cells"
- Destroy invading germs
- Rely on lymphocytes to tell them what to do

- "B cells"
- Formed in the bone marrow
- Produce antibodies
- Mediates humoral immunity

- Also called Immunoglobulin
- Latch onto viruses or bacteria 
- Communicates to the phagocytes and other surrounding proteins to destroy invaders

- "T cells"
- Formed in the thymus gland
- Killer T cells attack against foreign substances
- Helper T cells secrete cytokines