A set of third chromosome mutant stocks derived by insertional mutagenesis using the P-element construct P{lacW}; most lines have a lethal or semi-lethal phenotype. The P{lacW} construct carries a w+mC mini-white visible marker, Ecol\lacZ enhancer trap sequences, and bacterial sequences that allow plasmid rescue (FBrf0049800).
The insertions in dcoP103 and dcoS144701 fall into the same site in the first dco intron, 251 bp downstream from the 3' end of exon 1. The orientation of the insertion was not reported.