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Acquisition (Acq2) (A): Effect of water (CS−) or sucrose (CS+) intake on % changes of p-ERK-positive neurons/area in the PFCx (superficial and deep layers) and Acb (shell and core). Data, average + s.e.m., are expressed as % changes with respect to the effect in control group (CS−) set as 100% (n = 4 in each group); (B): timeline schedule of Acq2 experiment.
