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Scanning electron micrographs of the morphology of chicken yolk sac endodermal epithelial cells (EEC). (A, D) At E15, the surface areas of endodermal epithelial cells (EEC) are large, with microvilli structures beginning to form. (B, E) At E19, EEC begin to decrease in size while microvilli appear at the periphery of the cell surface. (C, F) At E21, EEC are smaller and microvilli cover the entire cell surface (Dayan, 2019).
