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Rescue of instrumental lever pressing by vrDD-DL mice. Operant conditioning was assessed in sham control (n = 12) and vrDD-DL mice (n = 8) using a simple lever pressing task. (A) Total number of lever presses for food per training day over a period of 18 days. (B) Lever press ratio during a 2-h progressive ratio training schedule. Data are expressed as mean ± SEM.
