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Quantitative analysis of Fos immunoreactivity (IR) in the PVN (A) and SON (B) 90 min after saline (s.c.) or naloxone (s.c.) administration to rats pretreated with placebo or morphine pellets. ***P<0.001 vs morphine+saline; +++P<0.001 versus placebo+naloxone. n=4 – 6 per group.
