Insertion of a Mi{Hto-WP} element, allowing overexpression of bon from the Scer\UAS regulatory sequences present in the element.
The retina is converted into an epithelium with hairs on most cells in flies expressing bonQYE under the control of Scer\GAL4GMR.PF and the ommatidial bristles are replaced by significantly larger socketed bristles. The ommatidia are apparent, but lack definition.