Humans controlled study female human Female 485 article 372 male 352 Male 346 adult 335 priority journal 335 Adult 254 human cell 182 Middle Aged 177 Article 153 nonhuman 149 metabolism 147 Animals 141 clinical article 126 protein expression 126 major clinical study 119 aged 107 physiology 100 Aged 99 animal 97 mouse 90 animal experiment 89 animal cell 87 Mice 86 genetics 85 unclassified drug 84