Why must T cell activation take place outside the thymus? 

A. An activated T cell could destroy the other maturing T cells.
B. An activated T cell could then destroy the thymus gland itself.
C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation.
D. Other cell types might be accidentally activated in the thymus.


C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation.

Biology & Microbiology

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