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

CD8
actin
HLA
interleukin

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

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

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Immune System
The role of the M cell is to

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
induce apoptosis in virus-infected small intestinal epithelia cells

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