Pineal GlandMelatoninAcetylserotonin O-MethyltransferasePinealomaArylalkylamine N-AcetyltransferaseCircadian RhythmReceptors, MelatoninSalivary GlandsMammary Glands, AnimalArylamine N-AcetyltransferaseExocrine GlandsSubmandibular GlandPhotoperiodLightDarknessParotid GlandSweat GlandsRetinaReceptor, Melatonin, MT1Sebaceous GlandsChickensSublingual Gland