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Fig. 5. Morphological changes in the posteriorized conditional mutant stomach: E16.5 whole embryos were sectioned sagittally and stained with Hematoxylin and Eosin for histological assessment. Corresponding regions in mutant and control were estimated by morphological characteristics of mesenchyme of each regions and relative location against other anatomical structures. (A,E) Duodenum. (B,F) Pyloric region. (C,G) Hind stomach. (D,H) Fore stomach. Oblique arrows across control and conditional mutant panels indicate changes of epithelial characteristics in the conditional mutants. e, epithelium; sm, smooth muscle layer.