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Aging
Female
4
Luteinizing Hormone
Rats
4
animal experiment
4
nonhuman
4
rat
Animal
3
Male
3
Serotonin
3
Support, Non-U.S. Gov't
3
Animalia
2
Follicle Stimulating Hormone
2
Prolactin
2
Rats, Inbred Strains
2
Sex Characteristics
2
Testosterone
2
endocrine system
2
gonadorelin
2
hormonal regulation
2
ontogeny
2
Animals
1
Animals, Newborn
1
Castration
1
Catecholamines
1
Cimetidine
1
Comparative Study
1
Diestrus
1
Dopamine
1
Endorphins
1
-
1
-
2
-
3
-
4