animal cell animal model controlled study nonhuman priority journal animal experiment 270 Animals 251 mouse 236 article 223 Mice 201 animal tissue 167 female 153 Female 120 protein expression 117 male 109 Humans 89 human 89 animal 88 Mice, Inbred BALB C 81 Male 79 cell proliferation 73 metabolism 73 unclassified drug 71 Article 66 in vivo study 64 in vitro study 60 rat 60 human cell 56 Rats 54 signal transduction 53