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Naloxone reduces respiratory neuronal activity within the pFRG/RTN area but not the preBötC/VRG area Correlation coefficient images before (A) and after (B) bath application of naloxone. The peaks of cross correlation function between C4VR activity and optical signal at each pixel were visualized by pseudocolour mapping. C, the orientation of the preparation is shown by the schematic drawing. IX/X, XI, XII, cranial nerves. BA, basilar artery; VA, vertebral artery.
