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Animal
Castration
Female
12
Pregnancy
Rats
animal experiment
rat
12
Estradiol
10
Estrus
10
estradiol
10
female genital system
10
endocrine system
8
Support, Non-U.S. Gov't
6
Uterus
6
progesterone
6
radioisotope
6
uterus
6
Luteinizing Hormone
4
Progesterone
4
Rats, Inbred Strains
4
Serotonin
4
estrus
4
in vitro study
4
nonhuman
4
pregnancy
4
preliminary communication
4
progesterone h 3
4
prostaglandin
4
serotonin
4
3,4 dihydroxymandelic acid h 3
2
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