animal cell female nonhuman 179 protein expression controlled study 168 Animals 153 priority journal 141 article 135 Female 134 animal experiment 133 mouse 117 Mice 107 animal tissue 93 animal model 85 animal 72 male 69 metabolism 66 human 64 Humans 62 unclassified drug 59 Male 53 Mice, Inbred BALB C 53 messenger RNA 48 human cell 47 Article 44 in vitro study 43 apoptosis 40 in vivo study 40 rat 40 protein function 38