Why are MHC-peptide molecules on a cell surface important?-display self-MHC class I and self-peptide show a healthy cell-display foreign peptide in class I to show cell is infected and activate T-cytotoxic cells-display foreign peptides in class II to show cell is infected and activate T-helper cells-display self peptide in class I and II to test developing T cells for autoreactivity (in primary lymphoid organs)-display self peptides in class I and II to maintain tolerance to self-proteins (in secondary lymphoid organs)
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