Immune System
The role of the M cell is to

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
pass bacteria or virus to underlying macrophages for processing and presentation of antigen

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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