Question: 3. what part of the bacterial cell is most involved in gram staining
[{'answer': 'peptidoglycan', 'provenance': [{'wikipedia_id': '12935', 'title': 'Gram stain', 'start_paragraph_id': 2, 'start_character': 141, 'end_paragraph_id': 2, 'end_character': 154, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]