genetic transfection 33 human 32 Article 28 Humans 25 controlled study 23 genetics 21 human cell 20 protein expression 18 metabolism 17 unclassified drug 17 nonhuman 16 Western blotting 13 in vitro study 13 male 13 cell proliferation 12 gene expression 12 upregulation 12 Animals 11 Male 11 down regulation 11 pathology 11 adult 10 animal 10 apoptosis 10 female 10 real time polymerase chain reaction 10 cell culture 9 signal transduction 9 small interfering RNA 9 Female 8