title: The pigment of duodenal melanosis is ferrous sulfide.
mesh_terms: D004378:Duodenal Diseases / Q000473:pathology*; D004386:Duodenum / Q000032:analysis; D004577:Electron Probe Microanalysis; D005260:Female; D005296:Ferrous Compounds / Q000032:analysis*; D006801:Humans; D007501:Iron / Q000032:analysis*; D008548:Melanosis / Q000473:pathology*; D008875:Middle Aged
chemical_list: D005296:Ferrous Compounds; D007501:Iron; C022597:ferrous sulfide