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).
Insertion P{lacW}S139614 is cytologically distinct from and not causally related to ttkS139614.
Insertion appears to be independent of the ttkS139614 allele on the same chromosome.