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Microinjection of carbachol into the dorsal parabrachial region (PBRd) of guinea pigs induces analgesia from the 5th to the 15th min postinjection, as evaluated by the reduction of the vocalization in response to an electric shock applied to one paw. When reversible blockade of the dorsomedial medulla or specifically of the nucleus tractus solitarius (NTS) is performed with xylocaine 5 min after...
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