Question: where is the microtubules located in a cell
[{'answer': 'cytoplasm', 'provenance': [{'wikipedia_id': '20621', 'title': 'Microtubule', 'start_paragraph_id': 1, 'start_character': 111, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20621', 'title': 'Microtubule', 'start_paragraph_id': 1, 'start_character': 13, 'end_paragraph_id': 1, 'end_character': 450, 'bleu_score': 0.8162114397787921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3955544204120303628}, 'section': 'Section::::Abstract.'}]}]