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'deletion': [86], 'mutants': [87], 'expressed': [88], '<i>Escherichia': [90], 'coli</i>': [91], 'were<i>in': [92], 'vitro</i>': [93], 'substrates': [94], 'two': [96], 'mammalian': [97], 'methyltransferases,': [100], 'PRMT1': [101, 111], 'PRMT3,': [103], 'with<i>S</i>-adenosyl-l-methionine': [104], 'methyl': [107], 'group': [108], 'donor.': [109], 'Both': [110], 'PRMT3': [113], 'specifically': [114], 'methylated': [115], 'arginines': [116], 'C-terminal': [119], 'domain': [120], 'corresponding': [121], 'naturally': [124], 'sites.': [126]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2003083382', 'counts_by_year': [{'year': 2023, 'cited_by_count': 1}, {'year': 2022, 'cited_by_count': 1}, {'year': 2021, 'cited_by_count': 1}, {'year': 2019, 'cited_by_count': 1}, {'year': 2017, 'cited_by_count': 3}, {'year': 2016, 'cited_by_count': 2}, {'year': 2015, 'cited_by_count': 4}, {'year': 2014, 'cited_by_count': 6}, {'year': 2013, 'cited_by_count': 6}, {'year': 2012, 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