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Diagrammatic representation of MET, EMT, egression and ingression. (A) Mesenchymal cells undergo MeT to epithelialize, as for example during somitogenesis. Conversely, epithelial cells undergo eMT to assume mesenchymal characteristics. (B) in an ingression, cells undergo EMT and leave an epithelium, while in an egression cells undergo MET and join a preexisting epithelium.
