Discussion
Which of the following is not involved in eliciting an immune response?
Answer: C
Correct answer: Brain
The brain is not a lymphoid organ; indeed it is immunologically privileged, shielded by the blood-brain barrier and patrolled by its own resident microglia rather than by circulating lymphocytes. The thymus is where T cells mature, and the spleen and lymph nodes are where antigen and lymphocytes are brought together for a response to begin.
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