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Experiment 2B. Mean numbers of licks in 1-h sessions of operant licking. Both groups of B6 mice were tested with empty spouts and 16% glucose (G) infusion. The Water group was shifted to water infusion, and the No Infusion group received no infusions in sessions 1 to 8. Significant differences (p < 0.05) between groups are indicated by asterisks.
