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Comparison of the unfrozen and vitrified cultured autologous oral mucosa epithelial cell sheets (CAOMECS). Control CAOMECS, CAOMECS frozen 18 days, and CAOMECS frozen for 204 days are well preserved in LN2. The CAOMECS frozen in the vitrification culture media broke during the thawing step, indicated by the dash lines. Scale bar is 254 μm [Colour figure can be viewed at wileyonlinelibrary.com]
