Immunostained Images (image) Neural Regeneration Research Caption Images immunostained with doublecortin (green) and DAPI (blue) show the 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 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.