Enriched in several structures, including anchor cell; carbon dioxide sensory neurons; cholinergic neurons; excretory pore; and hypodermis based on tiling array; RNA-seq; single-cell RNA-seq; and microarray studies. Is affected by several genes including cyc-1; swsn-2.2; and nuo-6 based on microarray; RNA-seq; and tiling array studies. Is affected by thirty-five chemicals including hydrogen sulfide; methylmercury hydroxide; and 1-methylnicotinamide based on microarray and RNA-seq studies.