MicroRNA-206 Down-Regulated Human Umbilical Cord Mesenchymal Stem Cells Alleviate Cognitive Decline in D-Galactose-Induced Aging Mice

After daily subcutaneous injection of D-gal (500 mg/kg/d) for 8 weeks, 17-week-old male C57BL/6 J mice were stem cells transplanted by lateral ventricular localization injection.