Genomic fragment containing both Dsec\Obp57d and Dsec\Obp57e.
D.melanogaster females carrying P{secObp57d-e.M} (containing both Dsec\Obp57dtMa and Dsec\Obp57etMa) in a Df(2R)Obp57d-eKO background prefer high concentrations of octanoic acid in an oviposition site-preference assay, as wild-type D.sechellia females do.
D.melanogaster males and females carrying P{secObp57d-e.M} (containing both Dsec\Obp57dtMa and Dsec\Obp57etMa) in a Df(2R)Obp57d-eKO background do not prefer hexanoic acid in an olfactory trap assay, in contrast to wild-type D.sechellia animals.