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[122], 'higher': [123], 'haptenation': [124], 'ratios': [125], 'greater': [127], 'efficacy': [128], 'thioether': [130], 'maleimide': [133], 'activated': [134], '(mKLH).': [136], 'The': [137], 'be': [141], 'used': [142], 'opioid': [147]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2109611492', 'counts_by_year': [{'year': 2024, 'cited_by_count': 6}, {'year': 2023, 'cited_by_count': 5}, {'year': 2022, 'cited_by_count': 3}, {'year': 2021, 'cited_by_count': 6}, {'year': 2020, 'cited_by_count': 9}, {'year': 2019, 'cited_by_count': 4}, {'year': 2018, 'cited_by_count': 7}, {'year': 2017, 'cited_by_count': 5}, {'year': 2016, 'cited_by_count': 4}, {'year': 2015, 'cited_by_count': 5}, {'year': 2014, 'cited_by_count': 6}, {'year': 2013, 'cited_by_count': 2}], 'updated_date': '2024-12-12T13:30:42.408670', 'created_date': '2016-06-24'}