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Figure 4


Fig. 4. Epithelial types in the egg cylinder stage. (A) A model of the cell types in the egg cylinder. In the visceral endoderm (VE) only the distal VE and the extra-embryonic VE are columnar epithelia, the rest are flat and squamous looking. The distal VE migrates to establish the anterior VE. As found by Srinivas et al. (Srinivas et al., 2004), its shape changes from columnar to squamous during the migration. (B) Expression of hensin (in blue) in the egg cylinder stage. Note that the embryo lacks parietal endoderm.





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