Astrocyte-like cells labeled with GFP via alrm-GAL4 driver. (A) This driver appears to be active in the same PER-positive giant glial cells of the medulla that were marked with ensheathing glia driver (see Figure 5). Scale bars equal 20 μm. (B) Brain outline indicating approximate location of cells shown in (A) in red and cells shown in (C) in blue. (C) Astrocytes labeled with GFP via alrm-GAL4 and located in the central brain (arrowheads) are PER-negative while ventral lateral neurons located nearby (arrows) show PER signal at ZT22. Scale bars equal 10 μm. Two small images on the right show additional PER-negative astrocytes in the central brain.