Fig. 3. (A) Visualization of the fluorescent deep pseudopupil (FDPP) in live flies. In the starting stock used for the screen (w,rdgA1, P[rh1-Rh1EGFP];parent), no FDPP can be seen. A distinct FDPP can be seen in the three suppressers isolated [rdgA1;su(1), rdgA1;su(40) and rdgA1;su(100)]. (B) TEM image of a single ommatidium from wild-type and rdgA1 mutants compared with those from rdgA1;su(1) and rdgA1;su(40) confirming the rescue of retinal degeneration as assessed by the FDPP. Similar results were obtained with su(100) (data not shown).