sami a.r

hey everyone, i have two question and hope i will found the answers here 1. why are primed T cells restricted to be activated by peptides presented by the same MHC that was "used" to prime them? 2. Can we "train" a naive T cell to "see" a peptide presented by an allogeneic MHC and if yes How would you do the experiment to prove the hypothesis? hope to recieve answers soon. thanx you all