Examine the evidence that the central nervous system is "immune privileged". What is a central observation that leads to this idea?

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The central observation leading to the idea that the central nervous system (CNS) is "immune privileged" is that tissue grafts are rejected when placed in the periphery of the body but are not rejected, or are rejected very slowly, when placed in the brain. This suggests a reduced immune response within the CNS compared to other parts of the body.

Examine the Evidence That the Central Nervous System Is "Immune