Plant tissue

特許 権利維持 Disclosed is a dried plant tissue or a plant tissue extract having a nonconventional significant ameliorating effect on central nervous system degenerative diseases, particularly Alzheimer's disease and Parkinson's disease. Specifically disclosed are a dried plant tissue and a plant tissue extract each having a nonconventional significant anti-Alzheimer's disease activity and/or a nonconventional significant anti-Parkinson's disease activity.