A thin section from a rat glioblastoma brain tumor was stained for cellular nuclei (blue) and macrophages (red and green). Macrophages, cells of the body’s immune system, surround and infiltrate the spherical tumor mass. Imaged using confocal fluorescence microscopy.

Image by Associate Professor Michael Dorrell (TSRI class of ‘04) and honors students Michael Marcacci, Jack Rusing and Zachary Sedillo of Point Loma Nazarene University.