Immune System
Natural killer cells are involved in

allograft rejection
all of these
non-specific killing of virus transformed target cells
tumour rejection

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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)

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

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