Immune System
The role of the M cell is to

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

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Immune System
Polymorphonuclear leukocytes (or PMNs)

All of these
are a type of phagocyte that can engulf and kill bacteria
can be attracted to the site of an infection following activation of complement
are derived from bone marrow stem cells

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