2bp deletion between the two putative transmembrane sequences in Osi23.
2bp deletion in Osi23 leads to a frameshift at amino acid 178 and early translation termination after the addition of seven novel amino acids.
Osi232 homozygotes show no visible defect in adult external morphology; the maxillary palp olfactory sensilla have significantly fewer nanopores, which is associated with severely reduced electrophysiological responses to both strong and weak odor stimuli, as compared to controls.
