How could T cytotoxic be responsible of graft rejection?

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If T cells are normally restricted to recognizing foreign peptides displayed by self-MHC molecules, why should these T cells recognize foreign MHC?

pleasezzzzzzzzzzzzzzzz help
 
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what i meant to ask is how can T cytotoxic (T8L) be responsible of graft rejection (graft material of foreign MHC i.e non self-MHC ), though it can recognize only foreign antigen associated with self MHC.