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The gut immune system has the challenge of responding to pathogenswhile remaining relatively unresponsive to food antigens andthe commensal microflora. In the developed world, this abilityappears to be breaking down, with chronic inflammatory diseasesof the gut commonplace in the apparent absence of overt infections.In both mouse and man, mutations in genes that control innateimmune recognition, adaptive immunity, and epithelial permeabilityare all associated with gut inflammation. This suggests thatperturbing homeostasis between gut antigens and host immunityrepresents a critical determinant in the development of gutinflammation and allergy.
1 Division of Infection, Inflammation, and Repair, University of Southampton School of Medicine, Southampton General Hospital, Southampton, SO16 6YD, UK. 2 Dipartimento di Medicina Interna e Centro di Eccellenza per lo Studio delle Malattie Complesse e Multifattoriali, Università Tor Vergata, Rome, Italy.
* Present address: Barts and the London School of Medicine andDentistry, Turner Street, London E1 2AD, UK.
To whom correspondence should be addressed. E-mail: t.t.macdonald{at}qmul.ac.uk
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