Animals 75 animal animal experiment human nonhuman 75 priority journal controlled study 73 Humans 71 metabolism 63 mouse 59 animal cell 55 Mice 51 animal model 51 Article 48 genetics 41 protein expression 35 unclassified drug 35 in vivo study 34 in vitro study 32 human cell 31 animal tissue 30 female 30 male 30 pathology 30 Male 28 Female 26 article 25 physiology 24 cell proliferation 21 cytology 20