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Mechanism of cell ingression. Before ingression, cells need to contract apically and disassemble tight and adherens junctions with their neighbours. During the process of ingression, cells get traction from the neighbour cells, extend protrusions and slide down, presumably, using a retrograde actin flow (black arrows). Finally, the cell acquires a mesenchymal phenotype and has converted the apicobasal polarity into a front-back polarity.
