Animals 176 animal controlled study human metabolism nonhuman Humans 172 animal cell 122 mouse 115 priority journal 101 Mice 99 animal experiment 97 Article 96 unclassified drug 93 human cell 89 genetics 87 protein expression 73 article 72 animal model 70 female 67 pathology 59 in vivo study 56 Female 55 physiology 55 chemistry 53 in vitro study 51 drug effects 48 animal tissue 45 male 42 gene expression regulation 40