Which of the following describe M cells in the gut? (Select all that apply.)
a. They derive their name from mucus cells.
b. They are located in the dome of a Peyer's patch.
c. They deliver antigens and pathogens from the lymphoid tissue to the luminal side of the gut mucosa by transcytosis.
d. They are protected from digestive enzymes by a thick glycocalyx and a layer of mucus.
e. They do not directly participate in antigen processing or presentation.
B,E
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