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Thermal hyperalgesia in plantar test. A, control group; B, Achilles tendon injury group; C, Achilles tendon injury and 2 mg/kg PDRN-applied group; D, Achilles tendon injury and 4 mg/kg PDRN-applied group; E, Achilles tendon injury and 8 mg/kg PDRN-applied group. PDRN, polydeoxyribonucleotide. *P<0.05 compared with the control group. #P<0.05 compared with the Achilles tendon injury group.
