Question: the protein actin is a component of a
[{'answer': 'microfilaments', 'provenance': [{'wikipedia_id': '438944', 'title': 'Actin', 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '438944', 'title': 'Actin', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 491, 'bleu_score': 0.572268967984764, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 830369989364942071}, 'section': 'Section::::Abstract.'}]}]