Mutation of the GCAATTA motif present at -472 relative to the start codon in the Or88a promoter sequence (the motif is mutated from GCAATTA to taccggc, which creates a partial motif, GCAAT, slightly displaced from its position in the wild type).
ScerGAL4Or88a.486M1 is expressed in the olfactory receptor neurons of a band of trichoid sensilla that extends across the distolateral region of the antenna, and extends axons into the antennal lobe.