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methodology
radioisotope
nonhuman
32
Animal
26
rat
24
Rats
22
Support, Non-U.S. Gov't
20
animal cell
20
animal experiment
20
Male
16
endocrine system
16
priority journal
16
pharmacokinetics
12
prolactin
12
Rats, Inbred Strains
10
central nervous system
10
drug administration
10
drug efficacy
10
etiology
10
Melatonin
8
drug binding
8
drug interaction
8
drug receptor binding
8
in vitro study
8
melatonin
8
Chorionic Gonadotropin
6
Comparative Study
6
Kinetics
6
Pineal Gland
6
chorionic gonadotropin
6
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