Immune System
Which of the following(s) is/are the determinants of antigenicity?

All of these
Size of the antigen
Chemical nature
Foreignness

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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
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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