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Animal
Male
Naloxone
Support, Non-U.S. Gov't
animal experiment
6
naloxone
6
nonhuman
6
Brachyura
4
Habituation (Psychophysiology)
4
arthropod
4
crab
4
habituation
4
Analgesia
2
Arousal
2
Danger stimulus
2
Dose-Response Relationship, Drug
2
Endogenous opioids
2
Escape Reaction
2
Fear
2
Melatonin
2
Non-painful stimulus
2
Norepinephrine
2
Opioid analgesia
2
Pineal Gland
2
Pineal gland
2
Rats
2
Rats, Inbred Strains
2
Receptors, Opioid
2
amphibia
2
analgesia
2
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1
-
2
-
3
-
4
-
5
-
6