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Male
central nervous system
Rats
11
Animal
10
endocrine system
10
pineal body
10
Pineal Gland
9
rat
9
animal experiment
8
Female
7
Melatonin
6
Support, Non-U.S. Gov't
6
radioisotope
6
melatonin
5
Rats, Inbred Strains
4
estradiol
4
in vitro study
4
nonhuman
4
prolactin
4
superior cervical ganglion
4
Castration
3
Circadian Rhythm
3
FSH
3
Ganglia, Sympathetic
3
Hamsters
3
Human
3
Hypothalamus
3
LH
3
Light
3
Luteinizing Hormone
3
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