The ab1C olfactory receptor neuron (ORN) has a reduced response to to CO[[2]] in homozygous flies compared to wild type. The response is further reduced in Gγ30Ae00834/Df(2L)ED678 flies.
The odour responses of the ab1A, ab2A and ab3A ORNs appear mostly normal in homozygous flies (the ab1A ORN has a slightly reduced odour response).