Comparison between the repellency of the two groups of chemicals.

<p>In both aphid species, chemicals binding exclusively OBP3 and/or OBP7 are much stronger repellents than other ligands with different spectra of binding. For <i>A. pisum</i>: χ<sup>2</sup> = 13.970, d.f. 1, P<0.001; for <i>M. persicae</i>: χ<sup>2</sup> = 96.044, d.f. 1, P<0.001.</p>