Insertion of a P{EP.y+.H} element upstream of the mir-278 locus.
Expression of mir-278EPC610, driven by Scer\GAL4GMR.PF, leads to overgrowth in the eye.
Some ommatidial cells in eye discs expressing mir-278mirvana-1 under the control of Scer\GAL4GMR.PF appear larger than in wild-type discs.