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Male
Melatonin
Rats
rat
6
central nervous system
5
melatonin
5
pineal body
5
Animal
4
Pineal Gland
4
animal experiment
4
in vitro study
4
Support, Non-U.S. Gov't
3
endocrine system
3
nonhuman
3
prolactin
3
radioisotope
3
Animals
2
Circadian Rhythm
2
Comparative Study
2
Hamsters
2
Light
2
Norepinephrine
2
Organ Culture Techniques
2
Pituitary Hormones, Anterior
2
Rats, Inbred Strains
2
Receptors, Cell Surface
2
Sex Hormones
2
animal cell
2
circadian rhythm
2
drug comparison
2
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