How do natural killer cells choose which cells to attack?

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Offline thedoc

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Jonathan Michael Acha  asked the Naked Scientists:
     
Hi, I would like to ask, if Natural Killer cells attack cells that have insufficient MHC class I molecules in their surface, then why don't they attack Red Blood Cells which are non-nucleated and have no MHC I molecules?

What do you think?
« Last Edit: 09/12/2014 15:30:01 by _system »