Question: what is the fluid part of the fluid mosaic model
[{'answer': 'The lipid bilayer', 'provenance': [{'wikipedia_id': '340440', 'title': 'Fluid mosaic model', 'start_paragraph_id': 1, 'start_character': 237, 'end_paragraph_id': 1, 'end_character': 254, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '340440', 'title': 'Fluid mosaic model', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1227, 'bleu_score': 0.834052132858859, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17967067662043812476}, 'section': 'Section::::Abstract.'}]}]