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Figure 1. M cells and the induction of mucosal immunity. M cells are present in mucosal inductive sites in both the
intestinal and upper respiratory tract, specifically in Peyers patches and the nasal-associated lymphoid tissue, the
tonsils and adenoids. M cells are thought to play an important role in antigen processing and possibly the induction of
antigen-specific mucosal immunity in mucosal effector sites. Sites followed by
question marks are presumed sites since limited data are available on these
sites.
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