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.... This brings about a readjustment of the cells, and causes the heretofore 2 to 3 layered epithelium to become single layered. File:Keibel Mall 2 239.jpg|1912 human embryo 4.9 mm

...of Human Embryology 17|gastrointestinal tract development]] in Keibel and Mall's 1912 Human embryology textbook.<ref name=KeibelMall1912>{{Ref-KeibelMall1 [[:File:Keibel Mall 2 293.jpg|Fig. 293]]. Sections showing the formation of the periportal ducts