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Representative photomicrographs of Fos immunoreactivity in the SON 90 min after saline (s.c.) or naloxone (5 mg kg−1 s.c.) administration to rats pretreated with placebo or morphine pellets. (A) placebo+saline, (B) placebo+naloxone, (C) morphine+saline and (D) morphine+naloxone. Scale bar, 87 μm. OC: optic chiasm.
