Ex vivo expanded hDPSC sheets grown for 7–10 days were fixed using 2.5 % glutaraldehyde in 0.1 mol/l sodium cacodylate buffer (pH 7.2) for 2 h at 4 °C. After washing with sodium dimethylarsenate buffer, the cells were post-fixed in 1 % osmium tetroxide, dehydrated with gradient alcohol, and then incubated with isoamyl acetate. After gold coating, five samples were examined using a Hitachi S-520 scanning electron microscope (Hitachi, Tokyo, Japan).
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