Effect of removal of the Harderian glands on pineal melatonin concentrations in the Syrian hamster.
Peak melatonin levels which are normally present in male Syrian hamsters at 8 h after the onset of darkness in animals maintained under a light:dark cycle of 14:10, were significantly decreased following the removal of the Harderian glands.
D000818:Animals; D002940:Circadian Rhythm; D006224:Cricetinae; D003624:Darkness; D006243:Harderian Gland / Q000502:physiology*; D007765:Lacrimal Apparatus / Q000502:physiology*; D008027:Light; D008297:Male; D008550:Melatonin / Q000378:metabolism*; D008647:Mesocricetus; D010870:Pineal Gland / Q000378:metabolism*
D008550:Melatonin