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Figure 6-49.
Schematic representation of gut tubulogenesis. Gut tube formation is initiated at the rostral end at stage 22, then gradually expands posteriorly, and finally reaches at the caudal end at stage 26. In the rostral portion, the cells are stacked dorsoventrally and form a rod-like structure, but later adopt a radial structure. In the intermediate and caudal regions, cells adopt a dorsoventrally elongated form, thereby forming an internal canal. (Kobayashi et al., 2006. Reproduced with permission of John Wiley & Sons, Inc.)