keywords ADULT-RAT BRAIN BASAL FOREBRAIN BDNF Biochemistry & Molecular Biology Clinical Neurology FACTOR MESSENGER-RNA FOREBRAIN CHOLINERGIC NEURONS Geriatrics & Gerontology HIPPOCAMPUS Life Sciences & Biomedicine NERVE GROWTH-FACTOR Neurosciences Neurosciences & Neurology SENILE DEMENTIA SURVIVAL SYSTEM Science & Technology