Question: where does the conversion of a prohormone into a hormone take place
[{'answer': 'hormone biosynthetic cells', 'provenance': [{'wikipedia_id': '13311', 'title': 'Hormone', 'start_paragraph_id': 89, 'start_character': 57, 'end_paragraph_id': 89, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Regulation.\n'}]}, {'provenance': [{'wikipedia_id': '13311', 'title': 'Hormone', 'start_paragraph_id': 89, 'start_character': 0, 'end_paragraph_id': 89, 'end_character': 276, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11290566836223893192}, 'section': 'Section::::Regulation.\n'}]}]