Iron and blood loss through the gastro-intestinal tract.
D002859:Chromium Isotopes; D004064:Digestive System / Q000378:metabolism*; D005243:Feces / Q000032:analysis; D006801:Humans; D007501:Iron / Q000378:metabolism*; D007503:Iron Isotopes; D008551:Melena / Q000378:metabolism*; D009780:Occult Blood
D002859:Chromium Isotopes; D007503:Iron Isotopes; D007501:Iron