human 167 Humans 140 male 100 Article 98 female 86 controlled study 85 metabolism 76 Animals 74 Male 71 animal 71 Female 65 adult 65 nonhuman 62 immunohistochemistry 54 pathology 51 mouse 43 Adult 41 genetics 41 unclassified drug 39 animal experiment 38 apoptosis 37 middle aged 37 Middle Aged 36 drug effect 33 Mice 32 animal tissue 32 human cell 32 procedures 32 human tissue 31 rat 31