nonhuman 16 opiate receptor naloxone 14 animal experiment 12 Naloxone 8 priority journal 8 Animal 6 Animals 6 Brachyura 6 Morphine 6 Support, Non-U.S. Gov't 6 animal cell 6 arthropod 6 crab 6 morphine 6 rat 6 Acetylcholine 4 Dose-Response Relationship, Drug 4 Electric Conductivity 4 Escape Reaction 4 Hair Cells 4 Male 4 Oocytes 4 Rats 4 Receptors, Nicotinic 4 Receptors, Opioid 4 Xenopus laevis 4 acetylcholine 4 animal 4 article 4