Neural Stem Cells (IMAGE) Neural Regeneration Research Caption Through transmission electron microscope, neural stem cells attached to the double-layer collagen membrane with unequal pore sizes and there was no structural change in the double-layer collagen membrane. 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.