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Characterization of residual DNA in the scaffolds. After H&E staining, cell nuclei were visible in (a) native sciatic nerve tissue but not in (b) hANSs or (c) dANSs. (d) Gel electrophoresis showed that the residual DNA fragments did not exceed 200 bp in hANSs or dANSs. White arrows denote (left-right) 10000 bp, 3000 bp, and 500 bp. The red arrow denotes 200 bp.
