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==Central Tolerance==
 
==Central Tolerance==
 +
[[Image:Thymic selection of t cells.jpg|thumb|right|150px|Negative selection of t cells- copyright Brian Catchpole]]
 
*Takes place within the thymus
 
*Takes place within the thymus
 
*Involves the processes '''positive''' and '''negative''' selection
 
*Involves the processes '''positive''' and '''negative''' selection
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