Question: how many binding sites for atp are there in pfk
[{'answer': 'two', 'provenance': [{'wikipedia_id': '14676253', 'title': '1-phosphofructokinase', 'start_paragraph_id': 2, 'start_character': 10, 'end_paragraph_id': 2, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14676253', 'title': '1-phosphofructokinase', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 1059, 'bleu_score': 0.899025351531306, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12515245948578864847}, 'section': 'Section::::Regulation.:Cellular.\n'}]}]