This transgene carries the genome reference allele.
Olfactory neurons expressing Aaeg\Or4A.Scer\UAS under the control of Scer\GAL4Or22a.8197 fail to respond to guinea-pig-odour, but respond consistently to a fraction of human odour corresponding to 6-methyl-5-hepten-2-one, commonly called sulcatone. The response to another widespread volatile benzaldehyde does not differ significantly between transgenic and control neurons.