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The daily weight in grams of each WT rat (empty symbol) and each Tg rat (filled symbols) across all stages of the experiment (see Figure 2 for a graphic of the timeline of the experiment). All cocaine doses are in units of mg/kg = milligrams per kilogram per intravenous infusion. * indicates the autoshaping session, FR = fixed ratio, VR = variable ratio, WT = wildtype, Tg = transgenic.
