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
they use their cilia to propel mucus out of the small intestine
trap virus in mucus and prevent entry
induce apoptosis in virus-infected small intestinal epithelia cells

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