Expression of epithelial cell markers in the differentiated cells, as shown by flow cytometry. Percentage of (A) cytokeratin-positive and (B) EPCAM-positive cells in the differentiated cells on day 21 following induction by EB, mouse embryonic fibroblast feeder cells or co-culture with endometrial stromal cells. EPCAM, epithelial cell adhesion molecule; EB, embryoid body; FITC, fluorescein isothiocyanate.