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==MHC I==
 
==MHC I==
[[Image:MHC I.jpg|thumb|200px|right|'''MHC I presentation pathway, courtesy of B. Catchpole, 2008''']]
+
[[Image:MHC I processing.jpg|thumb|200px|right|'''MHC I presentation pathway, courtesy of B. Catchpole, 2008''']]
 
===Structure===
 
===Structure===
 
* MHC class I is expressed on virtually all nucleated cells
 
* MHC class I is expressed on virtually all nucleated cells
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* Only MHC class I that is associated with peptide will be expressed at the surface
 
* Only MHC class I that is associated with peptide will be expressed at the surface
 
** The immune system is therefore able to see antigen from intracleeular pathogens
 
** The immune system is therefore able to see antigen from intracleeular pathogens
      
==MHC II==
 
==MHC II==
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