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. 2011 Aug 23;2:441. doi: 10.1038/ncomms1455

Figure 6. Concentration-dependent switch between attraction and avoidance in Or42a-functional larvae.

Figure 6

(a) Wild type (N=43 flies) and Or42a-functional (N=42) trajectories superimposed on the concentration landscape reconstructed for the approach paradigm at a low-concentration source of ethyl butye (7.8 mM). Heat map displayed in logarithmic scale. (b) Same as for (a) with wild type (N=43) and Or42a-functional (N=42) tested in a low-concentration source (125 mM) gradient. (c) Probability of turning to high as a function of the concentration range. For absolute odour concentrations lower than 100 nM, turns lead to randomized reorientation. Wild type (N=1,172 turns) show attraction at all other concentration ranges, whereas Or42a-functional (N=455) switch from attraction to avoidance at concentrations close to 500 nM. Error bars indicate s.e.m. Differences of turning probabilities with chance were tested by a one-tailed one-sample t-test (*P<0.05; ***P<0.001; NS, not significant P>0.05).