Figure 12.

Behavioral responses of larvae with one or two functional OSNs. Mean behavioral response indices (±SEM) for w¹¹¹⁸, [Or42a-Gal4/UAS-Or83b; Or83b ^−/−] (“Or42a”), [UAS-Or83b; Or59a-Gal4, Or83b ^−/−] (“Or59a”), and [Or42a-Gal4/UAS-Or83b; Or59a-Gal4, Or83b ^−/−] (“Or4a + Or59a”) larvae in a mass olfactory test. Anosmic Or83b ^−/− larvae were included as a control. Larvae were tested separately with four odors (A, butanol; B, ethyl acetate; C, propyl acetate; D, pentyl acetate). Eight tests, each involving at least 20 larvae, were performed for each genotype/odor combination. For full details, see Materials and Methods. P, Odor that induces precise, consistent electrophysiological activation in that OSN; O, odor that induces consistent absence of electrophysiological response in that OSN; F, odor that induces variable, fuzzy electrophysiological responses in that OSN (Fig. 5). Statistical comparisons (t test) were made compared with the responses of Or83b ^−/− larvae; *p < 0.05; **p < 0.01; ***p < 0.001.