Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of a species
They are antigens found in some members of different species
They are antigens found in all members of different species
They are antigens found in some members of a species

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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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