Donor construct for ends-out targeted replacement of psd Contains a 3162bp 5' flanking fragment from upstream of psd that contains the CG13992 gene, followed by w+mW.hs, followed by a 3316bp 3' flanking fragment from downstream of psd. The construct is designed to replace the 1147bp psd gene plus 115bp 5' and 58bp 3' flanking sequences with w+mW.hs.