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FGF-4–induced MAPCs exhibit polarization. The hMAPCs cultured with FGF-4 on Matrigel for 28 days. Representative example of two studies. Arrowhead, polarized cell; arrow, nonpolarized cell; star, binucleated cell. Scale bar, 25 μm. Staining for c-met-Cy3 (a), albumin-FITC (b), and overlap (c). Staining for c-met-Cy3 (d), CD26-FITC (e), and overlap (f).
