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The protocols followed for all series of experiments are presented as listed. RPC: remifentanil preconditioning; NS: normal saline; MNTX1: 0.5 mg·kg−1 of MNTX; MNTX2: 5 mg·kg−1 of MNTX; Va: vagotomy; RF: remifentanil; DVC: dorsal vagal complex.
