Immune System
Which is not an antigen-presenting cell (or APC)?

Polymorphonuclear leukocyte (or PMN)
Dendritic cell
B cell
All of these

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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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