Question: what component of the elisa causes the amplified signal
[{'answer': 'an enzymatic substrate', 'provenance': [{'wikipedia_id': '95162', 'title': 'ELISA', 'start_paragraph_id': 3, 'start_character': 849, 'end_paragraph_id': 3, 'end_character': 871, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '95162', 'title': 'ELISA', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 954, 'bleu_score': 0.953254139542769, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15532395212171624602}, 'section': 'Section::::Abstract.'}]}]