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Impaired LTP after morphine CPP is a consequence of the reexposure to the drug-paired chamber. A, A schematic of the experimental design is shown. B, C, Mice trained and tested for morphine CPP that are kept at their home cages for 7 d show LTP similar to saline-treated mice. C, Shows comparisons of fEPSP slopes during the final 10 min of recording.
