animal human 118 human cell nonhuman Animals 114 Humans 105 controlled study 101 metabolism 98 animal cell 89 mouse 82 Mice 72 unclassified drug 67 Article 64 animal experiment 61 priority journal 58 animal model 53 article 44 protein expression 43 genetics 41 in vivo study 41 pathology 38 chemistry 37 female 34 tumor cell line 33 Cell Line, Tumor 31 in vitro study 31 signal transduction 31 cell line 28 drug effects 28 Female 26