Analysis of DmPpt1S123A catalytic mutant over-expression. A-B, Scanning electron micrographs (200×). C-D, Light microscope images of semi-thin retinal sections. Scale bar= 2 μm. A and C, GMR:Gal4/UAS:DmPpt1S123A1. B and D, GMR:Gal4/UAS:DmPpt1S123A4. E. Quantification of the number of rhabdomeres per ommatidia in DmPpt1S123A over-expression eyes compared to DmPpt18.1 over-expression eyes. *p < .00001 by Ttest.