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Endodermal differentiation potential of villous chorion-mesenchymal stem or stromal cells (a-d). For hepatogenic differentiation, villous chorion-mesenchymal stem or stromal cells were induced in appropriate induction medium for 21 days. (a) Untreated cells. (b-d) Phase-contrast photograph of induced cells with magnification of ×10, ×20, and ×40 respectively
