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The epithelial and M cells of the intestine are credited with protecting the host from pathogen invasion through the gastrointestinal tract. Rescigno et al. report on page 361 that dendritic cells can form tight junctions and intercalate between epithelial cells, a location from which they are well positioned to contribute to host defense. See also the News & Views by Gewirtz and Madara on page 288. Welded steel relief of dendritic cells by Christopher Cassidy; original micrograph from Rescigno et al.
Historical insight: Paul Ehrlich's dictum of horror autotoxicus and the changing orientation of the field inhibited acceptance of the reality of autoimmune disease.