Immunostained (IMAGE) Neural Regeneration Research Caption These are images immunostained with doublecortin (green) and DAPI (blue) showing expression of c-Fos/doublecortin double-positive cells in layer II of the medial prefrontal cortex of guinea pigs 20 days post-environmental enrichment. Scale bar = 50 μm. Credit Neural Regeneration Research Usage Restrictions None 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.