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The Mauriceville and Varkud mitochondrial plasmids are closely related , closed - circular DNAs ( 3 . 6 and 3 . 7 kb , respectively ) that have characteristics of mtDNA introns and retroid elements .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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