Nassir Mokarram, Georgia Tech (image) Georgia Institute of Technology Caption Ph.D. student Nassir Mokarram (left) holds a hollow polymeric nerve guide used to study re-growth of peripheral nerve cells. The nerve guide released interleukin 4 (IL-4) which enhanced the growth of peripheral nerve cells by altering activity of the macrophage cells. Credit (Georgia Tech Photo: Gary Meek) 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.