Macrophages (IMAGE) University of Pittsburgh Caption Macrophages change their shape as they migrate inside a 3D collagen matrix. White stains collagen fibers, green stains macrophages and blue stains cell nuclei. Credit Zervantonakis Lab Usage Restrictions NA 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.