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Photomicrograph of the duodenum of a 24-year-old female diagnosed with irritable bowel syndrome based on Rome III criteria, who was found to suffer from celiac disease of Marsh type 1. The section was immunostained for CD45, which is a common leukocyte antigen and is expressed exclusively on cells of the hematopoietic system and their progenitors. Scale bar, 50 µm.
