Foreign sequence; species == Flavobacterium ATCC27551; gene == 'opd'; UniProt:P16648.
In a w- background Flav\opdc.hs is a marker that easily distinguishes transformed individuals with no detected false positives, and a negligible rate of false negatives.
Drosophila flies transformed with the gene encoding the cytoplasmic form of parathion hydrolase have high-level inducible resistance to paraoxon. The gene is expressed as a semidominant trait allowing separation of all three genotypes.