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Negatively supercoiled plasmid pUC19 did not compete , whereas an otherwise identical plasmid pUC19 ( CG ) , which contained a ( dG - dC ) 7 segment in the Z - form was an excellent competitor .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None