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Acknowledgements The authors gratefully acknowledge the generous provision of illustrations by Dr. M. Mallik ( Fig. 3-2 ), Dr. T. Lioe ( Fig. 3-3 ), and Dr. Y. Gong ( Fig. 3-20 ), and Dr. Andrew Field ( Plates 3-1A…

Introduction The digestive system is an integrated collection of anatomically and physiologically distinct organs and structures. They may be involved in a large number of important inflammatory and neoplastic diseases, most of which have been well characterized histologically. Yet, the…