Question: where can the phosphate portion of the phospholipids in a membrane be found
[{'answer': 'lipid bilayer', 'provenance': [{'wikipedia_id': '158011', 'title': 'Lipid bilayer', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '158011', 'title': 'Lipid bilayer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 913, 'bleu_score': 0.918923971440541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3496917280465352238}, 'section': 'Section::::Abstract.'}]}]