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Animal
2
Male
Melatonin
2
Pineal Gland
2
Rats
2
Support, Non-U.S. Gov't
central nervous system
2
endocrine system
melatonin
2
neurotransmitter
pineal body
2
radioisotope
2
rat
2
Cattle
1
Circadian Rhythm
1
Depression, Chemical
1
Endogenous opioids
1
English Abstract
1
Estrus
1
Female
1
Ganglia, Sympathetic
1
Hamsters
1
Human
1
Light
1
Models, Biological
1
Naloxone
1
Neurotransmitters
1
Norepinephrine
1
Ovulation
1
Pineal gland
1
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1
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2