Question: where does implantation of the blastocyst take place
[{'answer': 'the endometrium', 'provenance': [{'wikipedia_id': '7357937', 'title': 'Implantation (human embryo)', 'start_paragraph_id': 4, 'start_character': 29, 'end_paragraph_id': 4, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Implantation window.\n'}]}, {'provenance': [{'wikipedia_id': '7357937', 'title': 'Implantation (human embryo)', 'start_paragraph_id': 45, 'start_character': 0, 'end_paragraph_id': 45, 'end_character': 172, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6088454884465196480}, 'section': 'Section::::Mechanism.:Apposition.:Location.\n'}]}]