animal article controlled study priority journal Animals 219 nonhuman 219 metabolism 161 animal cell 128 physiology 112 mouse 109 animal experiment 107 Mice 103 drug effect 100 animal tissue 82 genetics 80 female 77 male 77 Female 65 protein expression 64 Male 61 unclassified drug 57 cytology 52 Humans 51 animal model 51 human 51 rat 50 chemistry 49 Rats 48 signal transduction 37 gene expression regulation 36