article human Humans 1,693 priority journal 1,279 controlled study 1,242 human cell 884 female 843 male 797 Female 732 adult 708 nonhuman 673 Male 669 Animals 656 Adult 497 unclassified drug 436 protein expression 348 clinical article 310 metabolism 310 animal cell 307 Middle Aged 306 animal 295 Mice 276 aged 269 Argentina 267 mouse 258 physiology 253 major clinical study 237 Aged 228 signal transduction 227 cell proliferation 200