Immune System
The role of the M cell is to

trap virus in mucus and prevent entry
pass bacteria or virus to underlying macrophages for processing and presentation of antigen
induce apoptosis in virus-infected small intestinal epithelia cells
they use their cilia to propel mucus out of the small intestine

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Immune System
T cell receptors (or TCR) on CD4+ T cells

recognize peptides associated with MHC class II molecules
recognize peptides not associated with MHC molecules
recognize peptides associated with MHC class I molecules
are secreted out into the environment to bind antigens

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