Question: what is the role of keratin in the skin
[{'answer': 'outer layer', 'provenance': [{'wikipedia_id': '43377', 'title': 'Keratin', 'start_paragraph_id': 1, 'start_character': 149, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43377', 'title': 'Keratin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 602, 'bleu_score': 0.915413377093219, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 667281016754868232}, 'section': 'Section::::Abstract.'}]}]