Melanin production.
D000818:Animals; D002400:Cathartics / Q000009:adverse effects; D002417:Cattle; D003108:Colonic Diseases / Q000139:chemically induced; D004947:Esophagus; D005123:Eye; D006801:Humans; D008543:Melanins / Q000096:biosynthesis*; D008548:Melanosis; D012756:Sheep; D013378:Substantia Nigra
D002400:Cathartics; D008543:Melanins