Enriched in mc1DL; mc1DR; mc1V; pm1; and pm2 based on single-cell RNA-seq studies. Is affected by several genes including skn-1; rrf-3; and eat-2 based on microarray; tiling array; and RNA-seq studies. Is affected by sixteen chemicals including nicotinic acid; rotenone; and D-glucose based on RNA-seq and microarray studies.