title: Scientists count brain cells to figure theory of aging.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D000818:Animals; D001921:Brain / Q000033:anatomy & histology / Q000166:cytology*; D001923:Brain Chemistry; D002531:Cerebellum / Q000033:anatomy & histology; D002540:Cerebral Cortex / Q000166:cytology; D002648:Child; D002675:Child, Preschool; D004247:DNA / Q000032:analysis; D000882:Haplorhini; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D051379:Mice; D008875:Middle Aged; D009457:Neuroglia / Q000166:cytology; D009474:Neurons / Q000166:cytology; D009929:Organ Size; D051381:Rats
chemical_list: D004247:DNA