VWF Glows Brightly Green under a Microscope (image) Rice University Share Print E-Mail Caption A strand of the clot-forming protein von Willebrand factor (VWF) glows brightly (green) under a microscope. The VWF is bound to many fluorescently labeled complement proteins called C3 (red dots), which are a part of the innate immune system. Credit Nancy Turner/Rice University Usage Restrictions For news reporting purposes only. Share Print E-Mail 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.