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Effect of day length during postnatal period on body weight. (A) Temporal changes in body weight. The mice exposed to long photoperiod for more than 16 h exhibited significant increases of body weight. P‐values, Bonferroni multiple comparison test following two‐way ANOVA. (B) Body weight at 10 weeks of age. *P < 0.05, **P < 0.01, Bonferroni multiple comparison test. Data are presented as means ± SEM.
