On the Cover: Multilabel confocal microscopy for haptoglobin in animals with SIV encephalitis. Colocalization of haptoglobin (green), CD163 (red), and Iba1 (microglia marker, blue) is shown in this image. These data suggest that breakdown of the blood-brain barrier is associated with activation of microglia and their expression of CD163 (see page 725).