(IMAGE) Institut Pasteur Caption Cross-section of a two-month-old cerebral organoid observed under a fluorescence microscope. The colours obtained by immunofluorescence labeling highlight certain elements of the organoid’s structure. In blue the cell nuclei, in green, a sub-population of immature neurons, and in red, neurogenic zones with a high concentration of stem cells, in the shape of rosettes, where new neurons are forming. Credit Credit: Institut Pasteur-SupBiotech. Usage Restrictions Please mention full copyright as well as the "Cerebral Ageing experiment" when using this picture. License Original 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.