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Embryonic cells of different stages during 6 days of culture. (a-f) ES-like cells from embryos at indicated stages. (g) Serial micrographs of YSL cell, showing the motility of the cytoplasm (asterisks) residing in the center and multiple nuclei (#) at the periphery. (h-l) YSL cells in cultures from embryos at stages indicated. Scale bars µm.
