rat Rats 62 nonhuman 60 article 56 priority journal 50 Animals 48 controlled study 48 animal cell 46 Cell Membrane 36 Male 32 male 26 Rats, Sprague-Dawley 24 animal experiment 24 animal 22 animal tissue 22 cell membrane 22 metabolism 18 Animal 16 enzyme activity 16 acetylcholine 14 drug effect 14 female 14 physiology 14 unclassified drug 14 Calcium 12 Humans 12 Receptors, Nicotinic 12 Support, Non-U.S. Gov't 12 human 12 nicotinic receptor 12