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The aim of the present study was to characterize the daily profiles of melatonin synthesis-related indoles in the pineal glands of male Hy-Line chickens hatched in the winter and reared under controlled light (L:D 12:12) conditions. The pineal glands were isolated from 16-day-old birds immediately after decapitation every 2h over a 24-h period. The indole contents were measured using HPLC with fluorescence...
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