Georgia Tech Ph.D. student Nassir Mokarram (left) and Professor Ravi Bellamkonda examine microscope images showing the growth of axons (red) and Schwann cells (green) in nerve guides that released interleukin 4 (IL-4).  The Bellamkonda group is altering the activity of macrophage cells to increase the rate at which nerve processes re-grow. (Georgia Tech Photo: Gary Meek)