cell line human metabolism nonhuman Cell Line 42 Humans 41 Animals 40 animal 40 controlled study 38 animal cell 36 human cell 29 unclassified drug 27 priority journal 25 article 23 Article 22 protein expression 21 genetics 19 mouse 16 physiology 15 Mice 14 drug effects 14 Western blotting 12 embryo 12 genetic transfection 12 chemistry 11 promoter region 11 animal experiment 10 messenger RNA 10 protein function 10 protein binding 9