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Nuclear changes suggestive of apoptosis were observed in TUNEL staining sections under light microscopy at a magnification of ×400. Apoptotic Schwann cell nucleus (arrowhead), normal Schwann cell nucleus (arrow). (A); Control group, (B); propolis (P) group (C); quercetin (Q) group, (D); P + Q group, (E); diabetes mellitus (DM) group, (F); DM + P group, (G); DM + Q group, and (H); DM + P + Q group.
