animal Animals 382 nonhuman 210 metabolism 174 chemistry 156 human 156 article 148 Humans 146 controlled study 146 Article 134 unclassified drug 120 physiology 112 genetics 110 male 110 priority journal 108 female 100 Male 90 Female 82 chemical structure 80 growth, development and aging 80 animal cell 66 animal structures 64 Animal Structures 62 structure activity relation 62 classification 60 drug effects 60 anatomy and histology 56 drug effect 54 animal experiment 52 mouse 52