title: Endogenous opiates and behavioral responses to environmental novelty.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000494:pharmacology*; D005106:Exploratory Behavior / Q000187:drug effects*; D008297:Male; D051379:Mice; D009270:Naloxone / Q000494:pharmacology; D013268:Stimulation, Chemical
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone