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Bars represent the means (± s.e.m.) over the last 3 stable testing sessions of: (A) total responses and (B) breakpoints as a function of reward type (cocaine versus saccharin) and of post-reward delay (0 versus 10 min). *, different from saccharin (P<0.01, Fisher's LSD test following a two-way ANOVA); #, different from 0-min delay (P<0.01, Fisher's LSD test following a two-way ANOVA).
