Stem Cells (IMAGE) University of Basel Caption When stem cells from the old brain are cultured with signals of a young choroid plexus they can divide and form new neurons (red). Credit Biozentrum, University of Basel Usage Restrictions give adequate attribution to the original author License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.