Collapsed Myelin Sheaths (IMAGE) Neural Regeneration Research Caption Myelin sheaths collapsed and the number of mitochondria was reduced in nerve fibers at 1,440 hours after implanting 29.6 MBq iodine-125 seeds. Credit <I>Neural Regeneration Research</I> 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.