Enriched in excretory duct; excretory pore; and in male based on RNA-seq and single-cell RNA-seq studies. Is affected by several genes including eat-2; sir-2.1; and csr-1 based on tiling array; RNA-seq; and microarray studies. Is affected by four chemicals including allantoin; Sirolimus; and metformin based on RNA-seq and microarray studies.