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The effects of naltrindole injection in the core (A) and the shell (B) on COS consumption during the first quarter of the session (left) and the last 3 quarters of the session (right) for the IA (black) WA (white) groups.
*: significant statistical difference from the WA group (p < 0.05).
###: significant statistical difference from control injection (p < 0.001); + trend to significance.
