Fig. 3. alr-1 mutants fail to respond to an AWA-sensed odorant. All strains except odr-3(n2150) contain stably integrated copies of odr-7::gfp. The responses of single animals of the indicated genotypes to a point source of a 1:1000 dilution of diacetyl or 1:200 dilution of benzaldehyde were examined. alr-1(oy42) and alr-1(oy56) animals expressed odr-7::gfp in both (1/1) or neither (0/0) AWA neuron(s). Asterisks indicate responses that are significantly different from wild-type responses (P<0.001). #, responses of animals lacking odr-7::gfp expression in both AWA neurons that are significantly different from the responses of animals of the same genotype expressing odr-7::gfp in both AWA neurons at P<0.001; nx30 for each.