Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

CD8
actin
interleukin
HLA

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

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

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Immune System
The role of the M cell is to

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

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