Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

HLA
interleukin
actin
CD8

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Immune System
The role of the M cell is to

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
trap virus in mucus and prevent entry
induce apoptosis in virus-infected small intestinal epithelia cells

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