title: Change of responsiveness to growth stimulation of normal cells during aging.
mesh_terms: D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival; D005347:Fibroblasts / Q000166:cytology; D006133:Growth Substances / Q000494:pharmacology*; D006801:Humans; D013997:Time Factors
chemical_list: D006133:Growth Substances