Animals controlled study nonhuman 128 article 98 priority journal 56 animal 54 animal cell 52 unclassified drug 50 animal experiment 46 animal tissue 46 female 42 Female 38 Humans 38 Male 38 male 38 Article 34 Mice 34 animal model 34 mouse 34 human 32 isolation and purification 30 Rats 28 in vitro study 28 rat 28 drug isolation 26 Argentina 24 cell isolation 24 protein expression 24 Animalia 20 Cell Line 20