Macrophages Montage (IMAGE) Emory Health Sciences Caption Brain tumor-associated microglia (left, green) and blood-derived macrophages (right, cyan) appear different when visualized by multiphoton microscopy. The microglia appear to be bushy and seaweed-like, exhibiting minimal migratory behavior, while the blood-derived macrophages are smaller and rounder, and zip around the tumor along blood vessels, shown in red. Credit Courtesy of Zhihong Chen Usage Restrictions To be used in connection with <em>PNAS</em> paper. 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.