Question: when does the antigen affect the valence or number of bonds
[{'answer': 'through weak chemical interactions', 'provenance': [{'wikipedia_id': '42233582', 'title': 'Antigen-antibody interaction', 'start_paragraph_id': 11, 'start_character': 25, 'end_paragraph_id': 11, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Properties.:Chemical basis of antigen-antibody interaction.\n'}]}, {'provenance': [{'wikipedia_id': '42233582', 'title': 'Antigen-antibody interaction', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 260, 'bleu_score': 0.8675979125638371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11260104925428150156}, 'section': 'Section::::Properties.:Chemical basis of antigen-antibody interaction.\n'}]}]