Fig. S1. Shift in time in the heroin-paired compartment during the postconditioning day compared with the preconditioning day in C57BL/6J and DBA/2J mice as measured in the CPP paradigm.

Fig. S2. Computer-enhanced autoradiograms of coronal brain sections from chronically ‘intermittent’ escalating dose heroin- or saline-treated C57BL/6J and DBA/2J mice.

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