Question: how does bicarbonate gets transported across the cell membrane
[{'answer': 'bicarbonate transporter proteins', 'provenance': [{'wikipedia_id': '32159238', 'title': 'Bicarbonate transporter protein', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32159238', 'title': 'Bicarbonate transporter protein', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 821, 'bleu_score': 0.9622032542074631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3690650967827454722}, 'section': 'Section::::Abstract.'}]}]