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Study sites: arrow, muscularis mucosae; A, arteriole; IC, inner circular smooth muscle; L, lumen; LP, lamina propria; MP, myenteric nerve plexus; OL, outer longitudinal smooth muscle; SE, surface epithelium; SG, submucosal mixed gland; SP, submucosal nerve plexus; SM, tunica submucosa; TM, tunica muscularis; TS, tunica serosa; V, venule. Hematoxylin and eosin staining.
