title: Effects of endorphin and enkephalin analogs on fear habituation in goldfish.
mesh_terms: D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D004723:Endorphins / Q000097:blood / Q000494:pharmacology*; D004745:Enkephalins / Q000097:blood / Q000494:pharmacology*; D005239:Fear / Q000187:drug effects*; D006054:Goldfish; D006185:Habituation, Psychophysiologic / Q000187:drug effects*; D011930:Reaction Time / Q000187:drug effects
chemical_list: D004723:Endorphins; D004745:Enkephalins