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. 2012 Aug 13;7(8):e42713. doi: 10.1371/journal.pone.0042713

Figure 1. Effect of maternal exposure to constant light and melatonin replacement on daily rhythm of maternal melatonin (A) and corticosterone (B) at day 18 of gestation.

Figure 1

Mean ± SEM of corticosterone and melatonin measured in maternal plasma collected every 4 hours from 4 pregnant dams maintained under LD (green symbols), 5 LL dams (Red symbols) and 5 LL+Mel dams (Blue symbols). *: Different from other time points for LD (P<0.05; ANOVA and Newman-Keuls). &: Different from other time points for LL+Mel (P<0.05; ANOVA and Newman-Keuls). #: Different from other time points for LL (P<0.05; ANOVA and Newman-Keuls). The grey bars indicate the clock time of lights off and melatonin replacement or placebo during subjective night.