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Study sites: IC, inner circular smooth muscle; L, lumen; MM, muscularis mucosae; MO, middle oblique smooth muscle; MP, myenteric nerve plexus; OL, outer longitudinal smooth muscle; P, Peyer’s patch; SE, surface epithelium; SM, tunica submucosa; SP, submucosal nerve plexus; TM, tunica muscularis; TS, tunica serosa; V, venule. Hematoxylin and eosin staining.
