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Ruffini-like endings identified in Group I (A), II (B), III (C), IV (D), normal control (E) and IV with degenerative and atrophic change (F), stained for S-100 (A, E, F), PGP 9.5 (B-D). Magnification,×100. (The time duration of injury to surgery, Group I: no more than 3 months; Group II: 3 to 6 months; Group III, 6 months to 1 year; Group IV: more than 1 year).
