Question: where are the enzymes and other proteins that make up the electron transport chain found
[{'answer': 'inner mitochondrial membrane', 'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 2, 'start_character': 252, 'end_paragraph_id': 2, 'end_character': 280, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '92236', 'title': 'Electron transport chain', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 541, 'bleu_score': 0.9458134147569861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3470594238365008999}, 'section': 'Section::::Abstract.'}]}]