A Neutrophil with Its Typical, Segmented Nucleus (image) Ecole Polytechnique Fédérale de Lausanne Share Print E-Mail Caption A neutrophil with its typical, segmented nucleus. A protrusion of the nucleus acts like a "double-edged sword", which the neutrophil wields to kill pathogens - but which also sometimes damages tissues and exacerbates diseases. Credit Etienne Meylan, EPFL Usage Restrictions Media purposes only. Commercial usage restricted; by permission 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.