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A: overall correct response during the water control test for each individual animal. Chance is 50%. B: mean (± SE) preference ratio to 10 mM Na-saccharin (vs. water) in a 48-h two-bottle preference test for each genotype group. An asterisk (*) denotes preference ratio scores between KO and WT groups were significantly different, while # denotes preference ratio scores that were significantly greater than 0.5.
