Question: where is the g protein linked receptor located
[{'answer': 'in the mammalian brain', 'provenance': [{'wikipedia_id': '12832', 'title': 'G protein-coupled receptor', 'start_paragraph_id': 28, 'start_character': 55, 'end_paragraph_id': 28, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Physiological roles.\n'}]}]