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

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

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Immune System
T cell receptors (or TCR) on CD4+ T cells

recognize peptides associated with MHC class I molecules
recognize peptides associated with MHC class II molecules
are secreted out into the environment to bind antigens
recognize peptides not associated with MHC molecules

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Immune System
The role of the M cell is to

induce apoptosis in virus-infected small intestinal epithelia cells
trap virus in mucus and prevent entry
they use their cilia to propel mucus out of the small intestine
pass bacteria or virus to underlying macrophages for processing and presentation of antigen

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