Table 2.

GPCR and odorant pairings

GPCR	Chemical Ligand	Neurons functioning in	Behavior	Reference(s)
ODR-10	Diacetyl (low)	AWA	Attraction	(Sengupta et al. 1996) (Zhang et al. 1997)
STR-2	2-Heptanone	AWCON	Attraction	(Zhang et al. 2016)
DCAR-1	Dihydrocaffeic acid Benzaldehyde ? (undiluted)	ASH	Avoidance	(Aoki et al. 2011)
SRI-14	Diacetyl (high)	ASH	Avoidance	(Taniguchi et al. 2014)
SRB-6	Dodecanoic acid Decanoic acid?	ASH, ADL, ADF (head)a PHA, PHB (tail)	Avoidance	(Tran et al. 2017)
STR-217	DEET	ADL	“Confusant”	(Dennis et al. 2018)

The limited number of C. elegans chemosensory GPCRs that have been paired with odorant ligands are shown.

^aSRB-6 rescued anterior response when expressed in these three head neurons, but promoters with more restrictive expression patterns were not used (Tran et al. 2017).