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'pancreatic': [88], 'cancer': [89], 'cells': [90], 'with': [91], 'higher': [94], 'level': [95], 'fluorescence': [97, 109], 'observed': [99], 'selectively': [100], 'hypoxia': [102], 'than': [103], 'normoxia.': [105], 'However,': [106], 'vivo': [108], 'mouse': [113], 'xenograft': [114], 'model': [115], 'after': [116], 'administration': [118], 'revealed': [119], 'inadequate': [120], 'accumulation': [121], 'tumors': [125], 'due': [126], 'to': [127], 'rapid': [129], 'elimination': [130], 'through': [131], 'liver.': [133]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W1976238338', 'counts_by_year': [{'year': 2021, 'cited_by_count': 3}, {'year': 2020, 'cited_by_count': 4}, {'year': 2018, 'cited_by_count': 1}, {'year': 2017, 'cited_by_count': 1}, {'year': 2016, 'cited_by_count': 4}, {'year': 2015, 'cited_by_count': 3}, {'year': 2014, 'cited_by_count': 2}, {'year': 2013, 'cited_by_count': 2}], 'updated_date': '2024-09-16T22:13:17.844967', 'created_date': '2016-06-24'}