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Behavior during tracer uptake for unanesthetized formalin and spared nerve injury (SNI). (A) Pain behaviors are only seen in formalin-injected rats. (B) Formalin-injected rats show more licking behaviors than saline-injected controls, and no significant difference is seen between SNI and Sham. (C) Formalin rats have more hindlimb motor activity than controls, and no significant difference is seen between SNI and Sham. Error bars +/− 1 S.E.
