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Body weight of Y4 receptor knockout mice. Body weight of male Y4−/− (▪) and female Y4−/− (●) mice compared with combined wild-type (Y4+/+) and heterozygous (Y4+/−) controls (males □, females ○). Values are means ± SEM of 20–32 mice per group. *P < 0.05 and **P < 0.01 versus curve for same-sex controls.
