animal human cell human 155 Animals 145 Humans 131 metabolism 127 controlled study 125 nonhuman 118 mouse 97 animal cell 91 Mice 87 unclassified drug 77 Article 74 article 71 priority journal 69 animal experiment 65 animal model 53 chemistry 52 protein expression 50 genetics 49 cell line 41 in vivo study 41 pathology 40 physiology 39 Cell Line 38 female 38 signal transduction 38 in vitro study 37 tumor cell line 37 Cell Line, Tumor 35