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Male
Rats
9
central nervous system
rat
Animal
7
animal experiment
7
endocrine system
7
pineal body
7
Pineal Gland
6
Melatonin
5
radioisotope
5
Female
4
Rats, Inbred Strains
4
Support, Non-U.S. Gov't
4
in vitro study
4
melatonin
4
Castration
3
FSH
3
LH
3
Testosterone
3
drug comparison
3
follitropin
3
luteinizing hormone
3
nonhuman
3
prolactin
3
testosterone
3
Animals
2
Circadian Rhythm
2
Comparative Study
2
Cyclic AMP
2
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