6. Where are lymph nodes found? What is the function of the germinal centers within lymph nodes? -   18. What is the function of antigen receptors and major histocompatibility proteins? -   20. Describe the process by which an antigen can cause an increase in helper T-cell numbers. -   21. Describe the process by which helper T cells can stimulate B cells to divide, differentiate, and produce antibodies.

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