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Higher c-Fos levels in the orbitofrontal cortex were observed for openers than for non-openers. (A) A comparison of total c-Fos numbers between five non-openers and eight openers in the retrograde experiment for rats tested with ingroup members. No difference was significant for the total FG+ numbers signifying structural connections (B) or the percent of co-labeled c-Fos+/FG+ cells (C) for these populations.
