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Schematic drawings showing the time lines for each experimental protocol. Please note that time indicators are not drawn to scale. In Protocol 2, intraperitoneal injection of receptor antagonists (NX, naloxone; AT, atropine) or the vehicle normal saline (NS) was made 10 minutes before auricular acupuncture (AA) and 20 minutes after AA. In Protocol 3, intraplantar injection of AT/NS was made following CA injection, just before AA.
