Animals 118 animal 112 nonhuman 72 human 67 Article 65 controlled study 55 Humans 51 mouse 51 animal experiment 50 male 48 Mice 40 metabolism 31 animal tissue 29 genetics 28 procedures 27 female 26 rat 26 Male 23 animal model 23 physiology 23 article 22 Female 20 animal cell 20 Rats 18 in vitro study 18 adult 17 chemistry 17 pathology 16 immunohistochemistry 15 priority journal 15