Immune System
Major Histo Compatibility Complex (MHC) is a collection of genes arrayed on

chromosome 21 in man, chromosome 6 in mice
chromosome 17in man, chromosome 6 in mice
chromosome 6 in man, chromosone 21 in mice
chromosome 6 in man, chromosome 17 in mice

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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
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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