Effect of maternal exposure to constant light and maternal melatonin replacement on the circadian rhythms and integrated mRNA expression of Bmal1, Per2, StAR, Mt1 and Egr1 in the rat fetal adrenal gland.

LD, mothers under light-dark cycle 12∶12 (n = 4/clock time). LL, mothers under constant lights between 10 and 18 days of gestation (n = 5/clock time). LL+Mel, Mothers under LL receiving a daily oral dose of melatonin (n = 5/clock time).*: Different from LD and LL+Mel (P#: Different from LD (Student t test).