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(A) The change of ambulation activity of rats in conditioned place preference apparatus before and after TRR surgery. Data were obtained from the preconditioning test on POD12 or before surgery, from a recording of the number of times any of the motion-sensing light beams was broken during a 15 min test period. (B) Difference in ambulation (post-op – pre-op) verified no significant ambulation activity change after TRR surgery. Data are expressed as means ± S.E of 11 rats per group.
