Figure 2. Effect of maternal exposure to constant light and melatonin replacement on fetal weight at different clock times along day 18 of gestation.

Mean ± SEM of fetal weight obtained at different clock times from 4 pregnant dams maintained under LD (Green), 5 maintained in LL (Red) and 5 maintained in LL+Mel (Blue). *: Different from LD and LL+Mel (P<0.05; Two way ANOVA and Bonferroni). The grey bars indicate the clock time of lights off and of melatonin replacement or placebo during subjective night.