Spine Survival (IMAGE) Picower Institute at MIT Caption Top row: A dendritic spine comes and goes around Day 14. Bottom row: a different spine becomes permanent after about four weeks. Credit Nedivi Lab/ MIT Picower Institute Usage Restrictions with credit 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.