2.)Thrombomodulin(TM) is a transmembranous glycoprotein, thrombin mediating formation of active protein C (APC) which involving proinflammatory and procoagulant process. Thrombomodulin- thrombin complex activate protein C and inhibits coagulation cascade. Lectin-like domain (D1) of TM prevents neutrophil and monocyte adhesion with inhibiting inflammation process. In addition, TM bind with HMGB1 (high-mobility group box 1) and prevent leukocyte activation demonstrated in previous study. HMGB1 appears to have a role in neuropathic pain involving dorsal root ganglion and peripheral nerve injury in recent investigations and develop many therapies aim to HMGB1 including antibody in recent days. HMGB1 interact with RAGE and related to induce hyperalgesia in a rodent model of neuropathic pain and pain hypersensitivity after peripheral nerve injury. In this branch study, the investigators will use various pain models to evaluate the expression of TM in tissues.