animal experiment rat 46 drug interaction 40 nonhuman 40 Rats 36 Drug Interactions 28 Animal 24 priority journal 24 Animals 22 Male 22 Support, Non-U.S. Gov't 22 animal cell 22 article 22 radioisotope 18 drug response 16 endocrine system 16 in vitro study 16 Female 14 Rats, Inbred Strains 14 drug comparison 14 drug efficacy 14 female genital system 14 controlled study 12 dose response 12 indometacin 10 noradrenalin 10 progesterone 10 subcutaneous drug administration 10 Castration 8 Mice 8