rat 860 Rats 746 nonhuman 691 article 581 animal experiment 491 priority journal 473 Animals 442 controlled study 427 animal cell 345 Male 325 Animal 323 Female 309 male 247 female 241 animal tissue 240 Support, Non-U.S. Gov't 209 animal 196 Rats, Sprague-Dawley 184 Rats, Inbred Strains 160 Animalia 154 unclassified drug 149 metabolism 145 endocrine system 132 animal model 131 radioisotope 123 in vitro study 122 Rats, Wistar 108 protein expression 105 enzyme activity 91 human 91