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Animal
Endogenous opioids
Male
1
Melatonin
1
Naloxone
1
Norepinephrine
1
Pineal Gland
1
Pineal gland
1
Rats
1
Rats, Inbred Strains
1
Support, Non-U.S. Gov't
1
animal experiment
1
central nervous system
endocrine system
1
endorphin
1
melatonin
1
naloxone
1
nervous system
1
neurotransmitter
1
nonhuman
1
noradrenalin
1
noradrenalin h 3
1
photoperiodicity
1
pineal body
1
radioisotope
rat
1
subcutaneous drug administration
1
synapse
1
-
1