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Morphine increases glutamate synaptic strength in neurons of the CeA. A, representative EPSCs evoked by an electrical stimulus at three intensities (maximum, one third maximum, and two thirds maximum) in a CeA neuron from a saline-treated control rat (control group) and from a morphine-treated rat with CPP behavior (morphine group). B, group data of the evoked EPSCs in neurons of the control group (n = 14) and of the morphine group (n = 12). *, p < 0.05; **, p < 0.01.
