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Experiment 2A. Mean numbers of licks (top) and infusions (bottom) in 1-h sessions of operant licking. Both groups of B6 mice were trained (T) with food-baited spouts and 16% sucrose infusion and then were shifted to licking on empty spouts. The Water group was shifted to water infusion, and the Fructose group to 16% fructose infusion. Significant differences (p < 0.05) between groups are indicated by asterisks.
