Animals Female Male male priority journal nonhuman 238 female 232 controlled study 191 article 180 animal experiment 137 animal tissue 117 animal cell 97 Mice 85 animal 85 mouse 85 Article 64 adult 63 protein expression 57 metabolism 51 animal model 48 genetics 48 Rats 41 Humans 39 rat 39 sex difference 38 gene expression 37 unclassified drug 37 physiology 35 human 33 Animalia 29