Striking Image (IMAGE) Bar-Ilan University Caption Human nerve cells made from embryonic stem cells infected with the varicella zoster virus, the causative agent of chicken pox and shingles. The nerve cells, along with their fine, long processes or axons, appear in red. Genetically engineered for fluorescence, the virus glows green. Credit Amos Markus 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.