How to regenerate mouse hearts (IMAGE) RIKEN Caption This research discovered that opossum hearts are able to regenerate 2 weeks after birth because AMPK activity was still inactive. Applying this knowledge to mice, researchers were able to prolong the period of time that mouse hearts can regenerate after birth by blocking AMPK activity. Credit RIKEN Usage Restrictions credit RIKEN 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.