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Rats
central nervous system
rat
Animal
86
animal experiment
84
endocrine system
60
Male
58
Support, Non-U.S. Gov't
58
nonhuman
56
radioisotope
56
Female
50
Rats, Inbred Strains
48
Pineal Gland
36
pineal body
34
animal cell
32
priority journal
30
Brain
26
Hypothalamus
26
hypothalamus
26
Cerebral Cortex
24
Animals
22
Melatonin
22
article
22
melatonin
20
nervous system
20
Castration
18
Estradiol
18
drug comparison
18
in vitro study
18
Norepinephrine
16
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