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

interleukin
HLA
CD8
actin

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Immune System
The role of the M cell is to

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

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