Question: where is fe best absorbed in the body
[{'answer': 'in the duodenum', 'provenance': [{'wikipedia_id': '3335116', 'title': 'Human iron metabolism', 'start_paragraph_id': 26, 'start_character': 109, 'end_paragraph_id': 26, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Mechanisms of iron regulation.:Systemic iron regulation.:Dietary iron uptake.\n'}]}, {'answer': 'the duodenum', 'provenance': [{'wikipedia_id': '3335116', 'title': 'Human iron metabolism', 'start_paragraph_id': 26, 'start_character': 112, 'end_paragraph_id': 26, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Mechanisms of iron regulation.:Systemic iron regulation.:Dietary iron uptake.\n'}]}, {'answer': 'duodenum by enterocytes of the duodenal lining'}, {'answer': 'in the duodenum by enterocytes of the duodenal lining'}, {'provenance': [{'wikipedia_id': '3335116', 'title': 'Human iron metabolism', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 684, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14096987179568984067}, 'section': 'Section::::Mechanisms of iron regulation.:Systemic iron regulation.:Dietary iron uptake.\n'}]}, {'provenance': [{'wikipedia_id': '3335116', 'title': 'Human iron metabolism', 'section': 'Section::::Mechanisms of iron regulation.:Systemic iron regulation.:Dietary iron uptake.\n', 'start_paragraph_id': 26, 'end_paragraph_id': 26, 'meta': {'evidence_span': ['Like most mineral nutrients, the majority of the iron absorbed from digested food or supplements is absorbed in the duodenum by enterocytes of the duodenal lining. These cells have special molecules that allow them to move iron into the body. To be absorbed, dietary iron can be absorbed as part of a protein such as heme protein or iron must be in its ferrous Fe form. A ferric reductase enzyme on the enterocytes brush border, duodenal cytochrome B (Dcytb), reduces ferric Fe to Fe. A protein called divalent metal transporter 1 (DMT1), which can transport several divalent metals across the plasma membrane, then transports iron across the enterocytes cell membrane into the cell. If the iron is bound to Heme it is instead transported across the apical membrane by Heme carrier protein 1 (HCP1).', 'Like most mineral nutrients, the majority of the iron absorbed from digested food or supplements is absorbed in the duodenum by enterocytes of the duodenal lining']}}]}]