metabolism human 880 Humans 856 genetics 594 Article 542 Animals 480 animal 480 controlled study 439 male 386 female 375 Male 342 Female 341 nonhuman 296 mouse 261 pathology 253 adult 250 chemistry 244 Mice 231 unclassified drug 193 physiology 181 drug effect 169 middle aged 157 gene expression regulation 155 Adult 154 Middle Aged 151 procedures 150 animal experiment 145 protein expression 144 gene expression 136 human cell 134