Immune System
The role of the M cell is to

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
induce apoptosis in virus-infected small intestinal epithelia cells
trap virus in mucus and prevent entry

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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