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
Polymorphonuclear leukocytes (or PMNs)

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

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