Fig. 1. Pph13^hazy mutants have malformed rhabdomeres and a dramatic loss in light sensitivity. (A,B) Transmission electron microscopy analysis of cn bw (A) and Pph13^hazy (B) ommatidium. Mutant rhabdomeres are small, malformed and individual microvilli are misaligned. (C) Electroretinograms of cn bw, Pph13^hazy and Pph13^hazy; hs-Pph13 (a Pph13 cDNA under the control of a heat shock promoter). Each consecutive 520 nm light pulse represents a 10-fold increase in light intensity relative to the previous one. The last light pulse is a 10 second pulse of 570 nm light at equal intensity to the last 1 second pulse. The reintroduction of the Pph13 cDNA rescues all Pph13^hazy mutant phenotypes.