human 34 Humans 26 Animals 21 animal 20 mouse 20 Medicine and Nursing 18 Neurosciences 17 Article 16 metabolism 16 Mice 15 genetics 15 controlled study 14 nonhuman 14 Biology, life sciences 13 human cell 12 male 11 stem cell 11 cell differentiation 9 gene expression 9 Medicine 8 Research & information: general 8 Stem Cells 8 animal cell 8 cell culture 8 Cell Differentiation 7 Galaxies 7 adult 7 cell proliferation 7 female 7 animal experiment 6