Fig. 3. Pph13 is expressed in Drosophila photoreceptor cells. Spatial and temporal expression profile of Pph13. (A) Stage 16 embryo. Pph13 is only detected in the bilateral cluster of cells that constitute Bolwig's organ. The box represents a higher magnification view. The staining of the embryonic trachea is non-specific. (B-D) Pph13 (green) and F-actin (red) staining of developing photoreceptor cells: (B) 36 hours APF; (C) 48 hours APF; (D) 72 hours APF. Pph13 expression is detected in all eight photoreceptor cells. At 72 hours APF, not all of the photoreceptor nuclei are shown in this optical section. (E-G) Pph13 (red) and Arr2-nuclear lacZ (green) expression in a cryostat-section of a 3-day-old adult head. Pph13 localization is maintained in adult Drosophila photoreceptor cells.