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Animal
Castration
Female
Rats
animal experiment
rat
40
endocrine system
28
Estradiol
24
estradiol
24
Support, Non-U.S. Gov't
22
female genital system
22
radioisotope
22
Rats, Inbred Strains
20
ovariectomy
18
Uterus
14
castration
14
central nervous system
14
uterus
14
Luteinizing Hormone
12
Pregnancy
12
progesterone
12
Estrus
10
Male
10
Pineal Gland
10
Progesterone
10
drug comparison
10
hypothalamus
10
luteinizing hormone
10
nonhuman
10
pineal body
10
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