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Sections of the primordial oesophagus on the 8th (a) and 11th (b) days of development showing the two layers, the epithelial and the mesenchymal layers. On the 8th day the epithelial lining was simple columnar while on the 11th day there was both simple columnar and stratified squamous epithelium. H and E ×100 (a), ×100 (b). (c) shows weak reaction of the epithelium at the 11th day of development. PAS ×400.
