human cell human 137 Article 122 Humans 107 controlled study 100 metabolism 64 unclassified drug 43 nonhuman 41 female 40 in vitro study 38 genetics 37 male 36 Animals 35 adult 34 animal 33 human tissue 32 chemistry 31 Female 30 protein expression 28 Male 27 article 26 gene expression 26 pathology 26 drug effect 24 major clinical study 24 Computational Biology 23 biology 23 mouse 23 procedures 23 Cell Line, Tumor 22