human Humans 123 cytology 107 metabolism 55 Article 48 cell culture 40 Cells, Cultured 38 controlled study 38 female 38 physiology 35 male 34 Female 33 adult 33 drug effect 33 genetics 30 Male 29 human cell 28 procedures 24 Animals 23 animal 23 cell proliferation 23 cell differentiation 22 Cell Proliferation 21 Cytology 21 pathology 21 Adult 20 in vitro study 20 Dental Pulp 18 gene expression 18 tooth pulp 18