Bone marrow neutrophils (IMAGE) University of California - San Diego Caption Neutrophils, blood cells that serve as a first-response to invading bacteria, feature nuclei that — rather than being uniformly round as most other cells — are divided into multiple petals or lobes, allowing them to migrate into densely populated tissues. Here they are shown in human bone marrow (purple cells) in the company of many red blood cells. Credit Dr. Huan-You Wang Usage Restrictions Must be used in conjunction with Nature paper on neutrophils and nuclei shape License Original 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.