Structural component of the gap junctions (By similarity). Required for coordinated locomotion (PubMed:7681023). Probably by regulating neuronal transmission downstream of lin-3 and receptor lin-23 and phospholipase plc-3 in ALA neurons, involved in the decrease in pharyngeal pumping during the quiescent state that precedes each larval molt (PubMed:17891142). Plays a role in regulating male mating behavior by positively regulating inhibitory neuronal signaling transduction between chemosensory and mechanosensory neurons, and thus ensuring spicule insertion attempts are confined to the hermaphrodite vulva during copulation (PubMed:26156999). Heterooligomer of unc-7 and unc-9. In hermaphrodites, expressed in all premotor and motor neurons, and in tail neurons (PubMed:26156999). In males, expressed in the anal depressor, gubernacular erector, gubernacular retractor and anterior oblique muscles, SPC, PCA, PCB, HOA, ray, head ganglion and ventral cord neurons (PubMed:26156999). Present in all developmental stages but most abundant in L1-L3 larvae. Restores pharyngeal pumping but not impaired locomotion in 33 percent of animals overexpressing lin-3. Belongs to the pannexin family.