Fig. S5.

Behavioral effects of odorants assigned to different structural classes. The 19 TAAR ligands used in these studies are all amines whereas the 54 other odorants can be assorted into 13 structural classes. This diagram shows the number of odorants in each class that elicited attraction (blue), aversion (red), or a neutral response (gray) using the olfactory preference test (see Fig. 1 for responses and Materials and Methods for names and abbreviations of odorants in each structural class). Odorants in some classes varied in their behavioral effects whereas the camphors and thiazoles tested uniformly caused aversion and the esters, ketones, and vanillin-like compounds all elicited a neutral response.