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We evaluated catheter - based transendocardial delivery of a recombinant adeno - associated virus ( rAAV ) expressing a small nuclear U7 RNA ( U7smOPT ) complementary to specific cis - acting splicing signals .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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