Humans cell line human 107 metabolism Cell Line 102 controlled study 85 human cell 75 article 57 priority journal 53 protein expression 51 Animals 50 animal 50 genetics 49 unclassified drug 48 Article 44 nonhuman 41 animal cell 34 physiology 33 female 32 signal transduction 31 Western blotting 30 drug effects 30 chemistry 29 Female 25 Trophoblasts 25 gene expression regulation 25 trophoblast 25 genetic transfection 23 protein binding 23 Signal Transduction 22